ARM vs. x86 is irrelevant from an energy efficiency POV

Article: AMD's Mobile Strategy
By: Wilco (Wilco.Dijkstra.delete@this.ntlworld.com), December 16, 2011 12:00 am
Room: Moderated Discussions
David Kanter (dkanter@realworldtech.com) on 12/15/11 wrote:
---------------------------

>More to the point, Linus is totally right that you cannot compare 4-wide x86 decode
>to a 4-wide ARM decode. The semantic content of the instructions is totally different.

And here is where you are both wrong. Eventhough the semantics are wildly different, ARM needs fewer instructions than x86 to execute the same program. Yes, it is counterintuitive, but that's the fact (I posted instruction counts and codesize figures in the past, and can do again if people are interested).

>There's no way to know how the two really compare without measuring dynamic instruction
>count on relevant workloads, but here are some thinking points:
>
>1. x86 is load+op, which is the equivalent of 2 ARM instructions. So the Nehalem
>decoder can output the equivalent of 8 ARMv8-A instructions.

If we're having a contest, I can do better: the current ARM decoders can output the equivalent of 32 x86 instructions every cycle.

Seriously, none of this matters at all. x86 cores cannot execute 4 load+operate instructions per cycle, so the ability to decode them is totally irrelevant. I believe the current sustained rate is 2 per cycle for load+op and just 1 for load+op+store. Of course these instructions take extra cycles, in fact they run at the same speed (or perhaps slower) as splitting them into separate instructions. These instructions are only useful when the loaded value is used exactly once, or if the register allocator cannot allocate the value to a temporary. If performance doesn't matter you can use them to avoid introducing an extra move (which are frequently required due to having just 2 operands).

Sorry to blow this bubble, but in general compilers don't use these instructions a lot, just like any other complex CISC instruction. It's this fact that sparked the RISC idea.

>2. ARMv8-A has twice as many registers, hence fewer register spills.

Correct for ARM64. But the spec is not public yet, so let's stick to ARMv7-A for now.

>3. x86 has more powerful addressing, reducing ALU ops.

False. General addressing modes are almost identical, except that ARM supports pre and post increment on all load/store variants, and supports both zero and sign-extending loads (x86 needs extra movzx/movsx instructions - you know, the ones Vincent is complaining about). ARM doesn't have absolute addressing, but does support PC-relative. So x86 has a slight advantage when accessing global variables as ARM needs to set up a global pointer (only needs to be done once per function), but the ARM way is actually better for codesize as you don't need to emit a 32-bit address/offset for every global access.

>4. x86 has microcoded instructions like REP MOV, which can translate into many
>ARMv8-A instructions. OTOH, this is a serious pain in the ass for decode, and for handling exceptions, atomics, etc.

They are also very slow - most x86 compilers inline a sequence of loads and stores for small to medium sized memcopies.

>5. ARMv8-A has a weaker ordering model, meaning that extra instructions are necessary.
>Often, x86 synchronization ends up as a NOP. Of course, this forces x86 to use large
>ordering buffers, whereas ARM does not.

True. I believe ARM64 now supports loads/stores with acquire and release builtin, so that avoids the need for extra barrier instructions.

>6. ARMv8-A has more robust conditionals.
>
>7. ARMv8-A does not have the blight known as x87.
>
>8. I can't recall how much of x86 and ARMv8-A are 2 vs. 3 operand and how much
>are destructive versus non-destructive, but this matters too.

Oh yes, it definitely matters. And the shift+alu operations. And the ability to set flags on every instruction. And having load/store multiple. And compare+branch. And pop+return. Etc.

>I'd also like to emphasize that many of the things which make x86 instructions
>more compact make decoding a real pain or have other implications on the pipeline.
>
>On the whole, I strongly suspect x86 has a lower dynamic instruction count...but
>I'm not sure by how much. Is it 10%, 20%, 30%? I have no basis for knowing (especially
>since there aren't many ARMv8-A workloads to run).

I strongly suspect x86 has a higher dynamic instruction count than existing ARM and Thumb-2. We don't know yet how ARM64 will do, my guess it will need ~10% more than Thumb-2 as the cost of the simpler instructions offset the other benefits. Note that doesn't mean it will be slower - complex instructions taking multiple cycles have been split into several single cycle instructions, simplifying decode and OoO execution.

>But that still is only part of the picture. While a 4-wide x86 decoder might be
>equivalent to 5-wide ARMv8-A decode, that still doesn't tell you how much harder
>x86 decode is...and what other costs it imposes throughout the pipeline.

Overall, I expect 4-wide ARM to be equivalent to 4-way x86 give or take a few percent. But like I said at the start, how many instructions you can decode is not directly related to performance. You're good as long as the decoder can keep the execute units busy. And branch prediction, memory system etc matters a lot as well.

Wilco
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TopicPosted ByDate
AMD's Mobile StrategyMark Pillsbury2011/12/14 06:58 PM
  ARM vs. x86 is irrelevant from an energy efficiency POV Daniel Bizo2011/12/15 05:30 AM
    ARM vs. x86 is irrelevant from an energy efficiency POV Foo_2011/12/15 06:08 AM
    ARM vs. x86 is irrelevant from an energy efficiency POV an2011/12/15 06:25 AM
      ARM vs. x86 is irrelevant from an energy efficiency POV Azazel2011/12/15 09:50 PM
        ARM vs. x86 is irrelevant from an energy efficiency POV Mike C2011/12/22 02:14 PM
          ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/23 07:06 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV Mike C2011/12/23 08:07 PM
    ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/15 07:46 AM
      ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/15 10:32 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV a person2011/12/15 10:59 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/15 11:18 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/16 07:22 PM
            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 06:56 AM
              Thumb vs ARM instruction countsnone2011/12/17 11:15 AM
                Thumb vs ARM instruction countsWilco2011/12/22 07:50 AM
                  Thumb vs ARM instruction countsExophase2011/12/22 08:56 AM
        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/15 11:44 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/15 03:24 PM
            ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/15 04:15 PM
              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/15 04:51 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/15 05:32 PM
                  ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/15 06:57 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/15 08:58 PM
                      ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/16 12:27 AM
                    Is scalar x86 decode that easy?Paul A. Clayton2011/12/15 09:20 PM
                      Is scalar x86 decode that easy?Linus Torvalds2011/12/16 12:09 PM
                        Is scalar x86 decode that easy?EduardoS2011/12/17 10:03 AM
                        Is scalar x86 decode that easy?Ricardo B2011/12/17 02:21 PM
                          Is scalar x86 decode that easy?Megol2011/12/18 05:23 AM
                            Is scalar x86 decode that easy?rwessel2011/12/18 10:04 AM
                              Is scalar x86 decode that easy?Megol2011/12/18 10:38 AM
                              Is scalar x86 decode that easy?Linus Torvalds2011/12/18 12:15 PM
                                Is scalar x86 decode that easy?Ricardo B2011/12/18 01:57 PM
                                  Is scalar x86 decode that easy?Linus Torvalds2011/12/18 02:49 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/16 12:00 AM
                    ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/17 12:13 PM
                      Conditional comparesMichael S2011/12/17 01:05 PM
                        Conditional comparesEduardoS2011/12/17 01:32 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/15 05:56 PM
                  ARM free to innovate?Paul A. Clayton2011/12/15 09:14 PM
                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 10:01 AM
                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/16 02:33 PM
                      ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 06:30 PM
                        ARM vs. x86 is irrelevant from an energy efficiency POV rwessel2011/12/17 12:51 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Octoploid2011/12/17 07:46 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 10:56 AM
                        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 07:45 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 11:31 AM
                            ARM vs. x86 is irrelevant from an energy efficiency POV anon2011/12/21 09:12 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/17 02:16 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 03:30 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV none2011/12/17 05:00 PM
                              ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 05:29 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/17 05:45 PM
                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 10:24 AM
                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 01:07 PM
                            ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 07:19 PM
                              ARM vs. x86 is irrelevant from an energy efficiency POV EduardoS2011/12/20 07:40 PM
                                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 08:02 PM
                                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 08:49 PM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 08:59 PM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/21 03:49 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 10:10 AM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/21 06:41 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/21 07:43 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 09:28 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/21 11:59 AM
                                              Cortex A9 latenciesS. Rao2011/12/21 09:12 PM
                                                Cortex A9 latenciesWilco2011/12/22 04:59 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/22 01:25 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 09:42 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/22 02:02 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/22 05:44 AM
                                              ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/22 07:57 AM
                                    (in)visibility of ISA featureshobold2011/12/21 06:27 AM
                              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 07:51 PM
                                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 08:13 PM
                                  ARM vs. x86 is irrelevant from an energy efficiency POV EduardoS2011/12/20 08:41 PM
                                    second to that (NT)Michael S2011/12/21 02:37 AM
                                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/20 09:03 PM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/20 11:05 PM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 02:22 AM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 09:28 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 10:06 AM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 10:33 AM
                                              ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 11:03 AM
                                                ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 11:33 AM
                                                  Adding modes for flexible imm. sizesPaul A. Clayton2011/12/21 04:08 PM
                                                  ARM vs. x86 is irrelevant from an energy efficiency POV anonymous2011/12/21 10:57 PM
                                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/21 11:12 PM
                                                      ARM vs. x86 is irrelevant from an energy efficiency POV anonymous2011/12/22 02:27 AM
                                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/22 08:27 AM
                                                ARM vs. x86 is irrelevant from an energy efficiency POV Brett2011/12/21 11:36 PM
                                            ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/21 05:34 PM
                                              ARM vs. x86 is irrelevant from an energy efficiency POV Seni2011/12/21 06:53 PM
                                                ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/22 06:42 AM
                                                  ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/22 05:29 PM
                                                    ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/22 07:17 PM
                                                      ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/22 08:23 PM
                                                        ARM vs. x86 is irrelevant from an energy efficiency POV Exophase2011/12/22 09:27 PM
                                                          Confused by AVX....David Kanter2011/12/23 12:05 AM
                                                            Celeron, PentiumMichael S2011/12/23 01:15 AM
                                                            Confused by AVX....S. Rao2011/12/23 01:27 AM
                                                            Confused by AVX....Gabriele Svelto2011/12/23 01:33 AM
                                                              Confused by AVX....David Kanter2011/12/23 12:58 PM
                                                                Confused by AVX....Gabriele Svelto2011/12/23 02:44 PM
                                      Load Single Register (pc-relative, literal load)Michael S2011/12/21 02:55 AM
                                        Load Single Register (pc-relative, literal load)Wilco2011/12/21 08:35 AM
                                          Load Single Register (pc-relative, literal load)Brett2011/12/22 12:20 AM
                                            Load Single Register (pc-relative, literal load)Exophase2011/12/22 08:32 AM
                                              Load Single Register (pc-relative, literal load)iz2011/12/22 05:45 PM
                                        Load Single Register (pc-relative, literal load)Exophase2011/12/21 09:34 AM
                                          Load Single Register (pc-relative, literal load)Wilco2011/12/21 04:29 PM
                                            Load Single Register (pc-relative, literal load)Exophase2011/12/22 08:37 AM
                                              Load Single Register (pc-relative, literal load)Brett2011/12/22 11:59 PM
                                          Load Single Register (pc-relative, literal load)Konrad Schwarz2011/12/27 05:07 AM
                                        Load Single Register (pc-relative, literal load)stubar2011/12/21 03:00 PM
                                          Load Single Register (pc-relative, literal load)Exophase2011/12/21 03:25 PM
                                            Load Single Register (pc-relative, literal load)Wilco2011/12/21 04:30 PM
                                              Load Single Register (pc-relative, literal load)anon2011/12/21 09:20 PM
                                                Load Single Register (pc-relative, literal load)Wilco2011/12/22 05:50 AM
                                                  Load Single Register (pc-relative, literal load)anon2011/12/22 06:11 AM
                                                    Load Single Register (pc-relative, literal load)Wilco2011/12/22 07:25 AM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/21 08:18 PM
                                        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/22 06:07 AM
                                          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/22 10:56 AM
                                            idle philosophizing about localityhobold2011/12/23 08:26 AM
                                              Streaming needs regularity, not locality (NT)Rohit2011/12/23 01:32 PM
                                                Streaming needs regularity, not localityiz2011/12/24 12:38 AM
                                                Streaming needs regularity, not localityhobold2011/12/24 04:49 AM
                                                  Streaming needs regularity, not localityRohit2011/12/24 08:52 AM
                                                  Streaming needs regularity, not localityEBFE2011/12/25 06:30 PM
                                                    Streaming needs regularity, not localityRohit2011/12/25 09:42 PM
                                                      Streaming needs regularity, not localityEBFE2011/12/25 11:49 PM
                                                        Streaming needs regularity, not localityRohit2011/12/26 09:53 AM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/21 02:57 AM
                                      ARM vs. x86 is irrelevant from an energy efficiency POV John Yates2011/12/26 10:46 AM
                                        Apollo Computer's DN10KBrett2011/12/26 06:56 PM
                                          Apollo Computer's DN10Kpeter huisken2011/12/27 07:40 AM
                                    ARM vs. x86 is irrelevant from an energy efficiency POV gallier22011/12/21 06:56 AM
                              ALU with shift; post-adjust, memcpyMichael S2011/12/21 03:22 AM
                                ALU with shift; post-adjust, memcpyExophase2011/12/21 09:02 AM
                                  memcpyMichael S2011/12/21 10:36 AM
                                    memcpyExophase2011/12/21 11:15 AM
                                    memcpyWilco2011/12/21 06:06 PM
                                      memcpyanon2011/12/21 09:15 PM
                                      memcpyMichael S2011/12/22 12:12 AM
                                        memcpyWilco2011/12/22 06:20 AM
                          Other x86 uop tricksDavid Kanter2011/12/20 07:21 PM
                            Other x86 uop tricksanon2011/12/20 07:35 PM
                              Other x86 uop tricksMichael S2011/12/21 03:55 AM
                            Other x86 uop tricksanon2011/12/20 07:53 PM
                            Other x86 uop tricksExophase2011/12/20 07:54 PM
                      stwxMichael S2011/12/17 10:46 AM
                        stwxWilco2011/12/17 11:33 AM
                          stwxMichael S2011/12/17 01:12 PM
            ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/16 11:06 AM
              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 11:17 AM
                Reason for shared decoderPaul A. Clayton2011/12/16 11:45 AM
                  Reason for shared decoderanon2011/12/16 06:37 PM
                    Reason for shared decodermpx2011/12/17 06:20 AM
                      Reason for shared decoderanon2011/12/17 04:19 PM
                        Reason for shared decodermpx2011/12/18 07:21 AM
                          Reason for shared decoderanon2011/12/18 08:30 AM
                          Reason for shared decoderKira2011/12/18 09:00 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/17 05:40 AM
                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/17 12:06 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV mpx2011/12/17 03:17 PM
        ARM vs. x86 is irrelevant from an energy efficiency POV Wilco2011/12/16 12:10 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV David Kanter2011/12/16 04:19 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/16 10:14 AM
          ARM vs. x86 is irrelevant from an energy efficiency POV Eugene Nalimov2011/12/16 11:07 AM
            ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/18 07:25 AM
              ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/18 12:48 PM
                ARM vs. x86 is irrelevant from an energy efficiency POV Michael S2011/12/18 04:01 PM
                  ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/18 05:21 PM
                    ARM vs. x86 is irrelevant from an energy efficiency POV Linus Torvalds2011/12/18 07:56 PM
      x86 compatibility is not as important as Microsoft compatibilityBrett2011/12/15 08:13 PM
      You're completley missing the pictureDaniel Bizo2011/12/16 08:12 AM
        Missed referencesDaniel Bizo2011/12/16 08:16 AM
          Missed referencesnone2011/12/16 09:17 AM
            Missed referencesDaniel Bizo2011/12/16 09:29 AM
    ARM vs. x86 is irrelevant from an energy efficiency POV Gabriele Svelto2011/12/15 12:55 PM
    ARM vs. x86 is irrelevant from an energy efficiency POV someone2011/12/15 01:19 PM
  AMD's Mobile StrategyDavid Kanter2011/12/15 06:13 PM
    AMD's Mobile StrategyMark Pillsbury2011/12/15 08:14 PM
      AMD's Mobile Strategybakaneko2011/12/15 08:57 PM
      AMD's Mobile StrategyDavid Kanter2011/12/15 10:53 PM
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      AMD's new GPU ISA less efficient?bakaneko2011/12/15 09:03 PM
      AMD's new GPU ISA less efficient?Rohit2011/12/15 09:09 PM
  AMD's Mobile StrategyIan Ollmann2011/12/16 09:21 AM
    AMD's Mobile StrategyMegol2011/12/16 09:33 AM
    AMD's Mobile StrategyDan Fay2011/12/16 07:02 PM
      AMD's Mobile StrategyMichael S2011/12/17 09:22 AM
        AMD's Mobile StrategyMegol2011/12/17 10:10 AM
          AMD's Mobile StrategyWilco2011/12/17 11:18 AM
        AMD's Mobile StrategyDan Fay2011/12/17 11:45 AM
    AMD's Mobile StrategyEduardoS2011/12/17 07:43 AM
      AMD's Mobile StrategyMichael S2011/12/17 11:55 AM
  AMD's Mobile StrategyBill Henkel2011/12/16 06:54 PM
    6 GHz 2-core water-cooled processorTom P2011/12/19 07:48 PM
      6 GHz 2-core water-cooled processorBill Henkel2011/12/19 08:21 PM
        6 GHz 2-core water-cooled processorgallier22011/12/20 01:31 AM
          "Benefit" of smaller market sharePaul A. Clayton2011/12/20 09:45 AM
            scalability of flash SSDSeni2011/12/20 11:22 AM
              USB drive price-point practical?Paul A. Clayton2011/12/20 12:49 PM
                USB drive price-point practical?Seni2011/12/20 02:02 PM
                  A minor comment on utilityPaul A. Clayton2011/12/20 03:19 PM
                    A minor comment on utilitySeni2011/12/20 03:35 PM
                    A minor comment on utilityFoo_2011/12/21 07:06 AM
                      100" Big screen.pH72011/12/26 12:37 PM
                USB drive price-point practical?David Hess2011/12/20 05:25 PM
                  USB drive price-point practical?iz2011/12/20 06:08 PM
                    USB drive price-point practical?David Hess2011/12/21 07:54 AM
                      USB drive price-point practical?iz2011/12/21 11:21 PM
                  USB drive price-point practical?Ungo2011/12/20 06:36 PM
                    USB drive price-point practical?David Hess2011/12/21 07:48 AM
              scalability of flash SSDEduardoS2011/12/20 03:50 PM
                scalability of flash SSDSeni2011/12/20 06:41 PM
                  scalability of flash SSDEduardoS2011/12/20 06:50 PM
                    scalability of flash SSDSeni2011/12/20 07:24 PM
                      scalability of flash SSDEduardoS2011/12/20 07:51 PM
                        scalability of flash SSDanon2011/12/21 04:03 AM
                          scalability of flash SSDanon2011/12/21 05:21 AM
                            scalability of flash SSDEduardoS2011/12/21 01:32 PM
                              scalability of flash SSDanon2011/12/21 03:49 PM
                                scalability of flash SSDEduardoS2011/12/21 04:58 PM
                                  scalability of flash SSDanon2011/12/21 09:00 PM
                                    scalability of flash SSDEduardoS2011/12/22 02:58 AM
                                    scalability of flash SSDRicardo B2011/12/22 08:36 AM
              scalability of flash SSDWes Felter2011/12/20 05:53 PM
                scalability of flash SSDSeni2011/12/20 06:24 PM
                scalability of flash SSDiz2011/12/20 06:29 PM
        6 GHz 2-core water-cooled processorExophase2011/12/20 09:05 AM
          6 GHz 2-core water-cooled processorEduardoS2011/12/20 03:58 PM
            6 GHz 2-core water-cooled processorExophase2011/12/20 06:13 PM
              6 GHz 2-core water-cooled processorEduardoS2011/12/20 06:43 PM
                6 GHz 2-core water-cooled processorExophase2011/12/21 11:36 AM
                  6 GHz 2-core water-cooled processorSeni2011/12/21 12:11 PM
                    6 GHz 2-core water-cooled processorExophase2011/12/21 12:26 PM
                  Diatomic Helium? (NT)Paul A. Clayton2011/12/21 03:50 PM
                    Sorry, should have read further in thread! (NT)Paul A. Clayton2011/12/21 03:52 PM
      6 GHz 2-core water-cooled processorsomeone2011/12/20 10:09 AM
        Per-core licensing fees.mpx2011/12/21 03:07 AM
    AMD's Mobile StrategyDoug Siebert2011/12/20 06:39 PM
  AMD's Mobile Strategy (NT)yundy2011/12/16 09:19 PM
  ARM transition is irrelevant from an economic POV Azazel2011/12/18 12:23 AM
  AMD's Mobile Strategypk2011/12/21 07:51 AM
    AMD's Mobile StrategyDavid Kanter2011/12/21 10:55 AM
      Samsung's fab technologyMark Roulo2011/12/21 11:34 AM
      AMD's Mobile StrategyAzazel2011/12/21 09:45 PM
        AMD's Mobile StrategyEduardoS2011/12/22 02:59 AM
          AMD's Mobile StrategyAzazel2011/12/22 10:03 PM
            AMD's Mobile StrategyEduardoS2011/12/22 11:51 PM
            AMD's Mobile StrategyVincent Diepeveen2011/12/24 11:15 AM
  AMD's Mobile StrategyAndrew Maizels2011/12/21 11:30 AM
  AMD's Mobile StrategyMr. Camel2011/12/27 09:50 AM
    AMD's Mobile StrategyMike C2011/12/27 11:01 PM
  Need for DifferentiationBill Henkel2011/12/29 12:22 PM
    Need for DifferentiationBrett2011/12/29 09:53 PM
      Need for DifferentiationVincent Diepeveen2011/12/30 11:29 AM
      Requested software features already in productCharles2011/12/30 09:35 PM
        Requested software features already in productSanjay B2012/01/11 04:45 PM
          Requested software features already in productBrett2012/01/11 10:18 PM
    Need for DifferentiationDavid Kanter2011/12/30 01:23 AM
      Need for DifferentiationVincent Diepeveen2011/12/30 11:17 AM
      Need for DifferentiationBill Henkel2012/01/03 07:01 PM
        Need for DifferentiationDavid Kanter2012/01/03 08:34 PM
    Need for DifferentiationVincent Diepeveen2011/12/30 11:09 AM
    L4 CacheBill Henkel2011/12/30 05:55 PM
      L4 CacheDavid Kanter2011/12/30 09:34 PM
        L4 CacheEduardoS2011/12/31 03:42 PM
          L4 CacheExophase2011/12/31 05:37 PM
      Need for speedDoug Siebert2011/12/31 01:07 PM
        Need for speedAlex M2012/01/06 03:38 PM
          Need for speedDoug Siebert2012/01/06 07:51 PM
        Need for speedTom J2012/01/10 04:44 PM
          Need for speedrwessel2012/01/10 05:30 PM
      L4 CacheRicardo B2011/12/31 02:25 PM
        L4 CacheBill Henkel2012/01/03 06:33 PM
          L4 CacheDavid Kanter2012/01/03 08:54 PM
            L4 Cache--not quite that bad?Paul A. Clayton2012/01/04 01:10 PM
              L4 Cache--not quite that bad?David Kanter2012/01/04 04:59 PM
                L4 Cache--not so bad (for Intel/IBM perhaps)Paul A. Clayton2012/01/04 08:01 PM
                L4 CacheBill Henkel2012/01/05 05:50 PM
                  Integration class price/performance tradeoffs?Paul A. Clayton2012/01/06 03:26 PM
                    Integration class price/performance tradeoffs?David Kanter2012/01/06 06:29 PM
                      InterposersMark Roulo2012/01/09 09:43 AM
                        InterposersDavid Kanter2012/01/10 12:13 PM
                    Integration class price/performance tradeoffs?Bill Henkel2012/01/06 06:52 PM
                      Beware of invention-stealing time travelers :-)Paul A. Clayton2012/01/06 08:31 PM
                        AMD PrototypePoindexter2012/01/07 06:20 AM
                    L4 Cache with Silicon InterposerTom J2012/01/08 05:50 PM
              L4 Cache--not quite that bad?rwessel2012/01/04 07:20 PM
                Temptation for expensive optimizationsPaul A. Clayton2012/01/04 08:20 PM
            L4 CacheDan Fay2012/01/04 05:51 PM
              L4 CacheRicardo B2012/01/04 06:39 PM
                L4 CacheDan Fay2012/01/04 06:57 PM
              L4 CacheKevin G2012/01/06 09:02 AM
          L4 CacheRicardo B2012/01/04 06:29 PM
            L4 CacheMichael S2012/01/05 07:21 AM
              L4 CacheRicardo B2012/01/05 11:01 AM
              L4 CacheRicardo B2012/01/06 06:06 AM
                L4 CacheMichael S2012/01/06 07:35 AM
                  Non-latency advantagesPaul A. Clayton2012/01/06 03:04 PM
                    Non-latency advantagesRicardo B2012/01/06 06:12 PM
                      Tag check delay??Paul A. Clayton2012/01/06 07:05 PM
                        Tag check delay??Ricardo B2012/01/06 08:18 PM
                          Thanks for sharingPaul A. Clayton2012/01/06 08:46 PM
            L4 Cachesomeone2012/01/08 05:06 PM
              L4 CacheRicardo B2012/01/08 06:28 PM
      L4 CacheVincent Diepeveen2012/01/08 02:11 PM
        L4 CacheJouni Osmala2012/01/09 03:24 AM
  Value of x86 in ServersGeorge Baker2012/01/04 10:55 AM
    Value of x86 in ServersDavid Kanter2012/01/05 02:40 AM
      Value of x86 in Serversrwessel2012/01/05 03:27 AM
        Value of x86 in ServersDavid Kanter2012/01/05 04:49 AM
      Value of x86 in ServersKira2012/01/09 05:22 PM
        Value of x86 in ServersJoel2012/01/09 09:20 PM
    Value of x86 in ServersDan Fay2012/01/05 09:03 AM
    Value of x86 in ServersAlex M2012/01/06 04:23 PM
    Value of x86 in ServersTom J2012/01/10 04:25 PM
      Value of x86 in Serversanon2012/01/11 12:44 PM
        Value of x86 in ServersGregory2012/01/12 06:11 PM
          x86 complexity or high-performance complexity?Paul A. Clayton2012/01/12 06:52 PM
          Value of x86 in ServersMichael S2012/01/13 06:39 AM
            Value of x86 in ServersRicardo B2012/01/13 03:14 PM
              Value of x86 in ServersMichael S2012/01/14 12:22 PM
  Heterogeneous ComputingAlex M2012/01/06 05:10 AM
    Thoughput != SIMDPaul A. Clayton2012/01/06 05:10 PM
  AMD's Processor StrategyJason Chan2012/01/10 06:06 AM
    AMD's Processor StrategyMark Roulo2012/01/10 06:21 PM
      AMD's Processor StrategyMegol2012/01/11 03:51 AM
        AMD's Processor StrategyDavid Hess2012/01/11 10:46 AM
    AMD's Processor StrategyAzazel2012/01/12 09:46 PM
      AMD's Processor StrategyVincent Diepeveen2012/01/13 06:28 AM
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