New CELL Article Online

Article: CELL Microprocessor III
By: Deadmeat (Deadmeatoa.delete@this.yahoo.com), August 8, 2005 5:05 pm
Room: Moderated Discussions
>Unfortunately, it does not. You're presuming that the 68 FLOPS per cycle that Sony
>is claiming are all FADD or FMULTS, then seeking to justify where those FADD/FMULT
>must come from. There's no support for that presumption in this slide or any other slide I have seen.

Sure there is. The CPU core is clearly dual issue; it can issue only two instructions per cycle max. The FPU/Altivec unit instruction queue can issue two instructions per cycle max.

This means that 12 FLOPS must be provided within that two instructions. Altivec provides 8 FLOPS. FPU provides 4 FLOPS.

> The answer I received was in essence "no comment". **

Since MS is claiming the same 38.4 GFLOPS/s per core, it is not some number pulled out of a marketing manager's imagination.

>The best alternate theory not having anything to do with Gekko and still make the
>218 GFLOPS number is that Sony is counting some sort of load/store/comparison instruction
>as a 4 wide "FP" operation for the DD2 PPE.

SCEI didn't go that low with PSX2's VU FLOPS, and I am not about to believe that they would go even lower than PSX2's FLOPS counting methodology.

BTW, they don't even consider load/store into FLOPS rating, all theoretical FLOPS claims are obtained by assuming repeated FMAC instructions only.

>So we're back to square one.

I am convinced that Gecko FLOPS are at work here, especially looking at that diagram, so this issue is settled for me.
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
New CELL Article OnlineDavid Kanter2005/08/02 11:32 AM
  New CELL Article Onlinemas2005/08/02 12:46 PM
    New CELL Article Onlinemas2005/08/02 12:53 PM
    New CELL Article OnlineDavid Wang2005/08/02 01:46 PM
      New CELL Article Onlinefastpathguru2005/08/02 04:05 PM
        New CELL Article OnlineDavid Wang2005/08/02 06:27 PM
          New CELL Article OnlinePanajev2001a2005/08/03 03:26 AM
            New CELL Article OnlineDavid Wang2005/08/03 11:28 AM
              New CELL Article OnlineDeadmeat2005/08/04 01:05 PM
                New CELL Article OnlineDavid Wang2005/08/04 05:47 PM
                  New CELL Article OnlineDeadmeat2005/08/04 07:04 PM
                    New CELL Article Onlinejohn evans2005/08/04 08:30 PM
                      New CELL Article OnlineDeadmeat2005/08/05 12:10 PM
                        New CELL Article OnlineLinus Torvalds2005/08/05 06:21 PM
                          New CELL Article OnlineDeadmeat2005/08/05 07:33 PM
                            New CELL Article Onlinefastpathguru2005/08/05 10:36 PM
                              New CELL Article Onlinejohn evans2005/08/05 10:51 PM
                              New CELL Article OnlineDeadmeat2005/08/06 04:09 AM
                                New CELL Article Onlinefastpathguru2005/08/06 06:29 AM
                                  New CELL Article OnlineDeadmeat2005/08/07 04:06 PM
                    New CELL Article OnlineDavid Wang2005/08/04 09:03 PM
                      New CELL Article OnlineDeadmeat2005/08/05 12:21 PM
                        New CELL Article OnlineDavid Wang2005/08/05 11:51 PM
              New CELL Article OnlineDavid Wang2005/08/06 12:00 AM
                New CELL Article OnlineDeadmeat2005/08/07 03:39 PM
                  New CELL Article OnlineDavid Wang2005/08/08 01:57 PM
                    New CELL Article OnlineDeadmeat2005/08/08 02:55 PM
                      New CELL Article OnlineDavid Wang2005/08/08 03:37 PM
                        New CELL Article OnlineDeadmeat2005/08/08 05:05 PM
                          New CELL Article OnlineDavid Wang2005/08/08 05:47 PM
                            New CELL Article OnlineDeadmeat2005/08/08 06:25 PM
                              Implausible at best, irrational most likely...David Kanter2005/08/08 06:51 PM
                                Implausible at best, irrational most likely...Deadmeat2005/08/09 10:26 AM
                              New CELL Article OnlineDavid Wang2005/08/08 07:46 PM
                                New CELL Article OnlineDeadmeat2005/08/09 10:36 AM
                                  New CELL Article OnlineDavid Wang2005/08/09 11:12 AM
                                    New CELL Article OnlineDeadmeat2005/08/09 01:26 PM
                                      New CELL Article OnlineDavid Wang2005/08/09 02:36 PM
                                New CELL Article OnlineAaron Spink2005/08/09 02:57 PM
                                  New CELL Article OnlineDavid Wang2005/08/10 10:06 AM
                    New CELL Article OnlineSerge Monkewitz2005/08/09 01:18 PM
                      New CELL Article OnlineDeadmeat2005/08/09 01:30 PM
                        New CELL Article OnlineVitaly Vidmirov2005/08/11 01:36 AM
      New CELL Article OnlineAnonymous2005/08/03 04:11 PM
        New CELL Article Onlinefastpathguru2005/08/03 05:19 PM
          New CELL Article Onlinemas2005/08/03 07:59 PM
            New CELL Article OnlineJosé Javier Zarate2005/08/04 05:20 AM
              New CELL Article Onlinemas2005/08/04 05:27 AM
          New CELL Article Onlinemas2005/08/05 06:50 AM
  New CELL Article OnlinePiedPiper2005/08/02 09:02 PM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell purple?