Stacked Cache Chips

Article: Intel’s Long Awaited Return to the Memory Business
By: Jason Lee (jasonlee.delete@this.nospam.com), February 21, 2014 9:49 pm
Room: Moderated Discussions
AlbertH (please.delete@this.email.address) on July 10, 2013 4:50 pm wrote:

After Haswell-E (maybe Broadwell-E), I think Intel will embed Crystalwell cache chips
in the printed circuit board of the package substrate. They could put 4 Crystalwell
chips on the 4 sides of a processor in the epoxy of the package substrate and 4 more
Crystalwell chips on top of the package substrate. To do this, they would solder 4
Crystalwell chips to the bottom half of the package substrate. Then they would put
a layer of epoxy and glass fiber on top of the 4 chips between the bottom half of the
package substrate and the top half of the package substrate. Then they would heat and
press this sandwich. Then they would drill and plate the vias. Then they would test
the assembly. Finally, they would solder the processor and the top 4 Crystalwell chips
to the top of the package substrate. This would provide 1 or 2 GBytes of cache using
128 MByte or 256 MByte Crystalwell chips. I expect this to first appear in the 4-socket
Xeons. This 1 or 2 GBytes will be the last level of cache. There could be one or two
smaller and faster cache chips on top of the processor in addition to this last level
of cache. Part of the L3 cache in the processor could be repurposed to hold the tags for
this enormous last level cache. Examples of applications for this type of assembly are
in-memory databases such as SAP HANA and bioinformatics. This assembly could also be
used in supercomputers with no additional DRAM. I don't have any confidential information
so this is all speculation on my part.
Instead of putting the cache chips on 4 sides of the processor chip, another way to do this is to thin the cache chips and stack the cache chips on top of each other. Stacking the cache chips would result in a smaller package so the lower-end processors would not be burdened by a large package to make the processors interchangeable. Up to 8 flash memory chips are regularly stacked on top of each other today.

Through silicon vias would be needed because of the wide interface between the cache chips and the processor chip. Through silicon vias are said to be expensive but Intel currently charges up to $2500 per processor for their dual-socket server chips (Ivy Bridge-EP) and up to $6600 per processor for their quad-socket server chips (Ivy Bridge-EX). Through silicon vias are not expensive compared to the price of a multi-thousand dollar processor.




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Article: Intel's Long Awaited Return to the Memory BusinessDavid Kanter2013/04/23 07:14 AM
  Article: Intel's Long Awaited Return to the Memory BusinessVarun2013/04/23 08:26 AM
    L4 Cache on Haswell-ETed J.2013/07/08 03:06 PM
      L4 Cache on Haswell-EDwight2013/07/09 03:18 PM
    Cache Chips Embedded in Package SubstrateAlbertH2013/07/10 03:50 PM
      Stacked Cache ChipsJason Lee2014/02/21 09:49 PM
        Stacked Cache ChipsDoug S2014/02/23 11:09 AM
          Stacked Cache ChipsMaynard Handley2014/02/23 05:55 PM
          Stacked Cache ChipsShiv2014/02/23 08:59 PM
  Article: Intel's Long Awaited Return to the Memory Businesssomeone2013/04/23 11:11 AM
    Article: Intel's Long Awaited Return to the Memory BusinessDavid Kanter2013/04/23 11:15 AM
      Article: Intel's Long Awaited Return to the Memory Businesssomeone2013/04/23 11:22 AM
      MIM capslacker2013/04/23 09:30 PM
        MIM capDavid Kanter2013/04/23 10:49 PM
          MIM captarlinian2013/04/24 07:40 AM
            This is my guess as well (NT)slacker2013/04/24 04:19 PM
        MIM capRob Thorpe2013/04/24 02:23 AM
  Article: Intel's Long Awaited Return to the Memory BusinessUngo2013/04/23 11:33 AM
    Article: Intel's Long Awaited Return to the Memory BusinessDavid Kanter2013/04/23 11:48 AM
      Article: Intel's Long Awaited Return to the Memory BusinessRohit2013/04/23 12:53 PM
        Article: Intel's Long Awaited Return to the Memory Businessdefault2013/04/24 08:29 AM
          Article: Intel's Long Awaited Return to the Memory BusinessRohit2013/04/25 07:21 AM
      Article: Intel's Long Awaited Return to the Memory BusinessUngo2013/04/23 09:08 PM
    Article: Intel's Long Awaited Return to the Memory BusinessAlpha2013/04/24 08:10 AM
      Article: Intel's Long Awaited Return to the Memory BusinessJames2013/04/24 08:39 AM
        DRAM power - sanity checkEduardoS2013/04/24 08:53 AM
          DRAM power - sanity checkMark Roulo2013/04/24 09:38 AM
            DRAM power - sanity checkEduardoS2013/04/24 10:32 AM
              DRAM power - sanity checkKevin G2013/04/25 06:36 AM
  Article: Intel's Long Awaited Return to the Memory BusinessFormula3502013/04/23 01:58 PM
    Article: Intel's Long Awaited Return to the Memory BusinessMark Roulo2013/04/23 02:20 PM
      Article: Intel's Long Awaited Return to the Memory BusinessAntti-Ville Tuunainen2013/04/23 04:25 PM
        Article: Intel's Long Awaited Return to the Memory BusinessJukka Larja2013/04/24 05:21 AM
        Article: Intel's Long Awaited Return to the Memory BusinessKevin G2013/04/25 06:48 AM
    Article: Intel's Long Awaited Return to the Memory BusinessDavid Kanter2013/04/23 03:04 PM
    Article: Intel's Long Awaited Return to the Memory Businessaaron spink2013/04/23 06:30 PM
      Article: Intel's Long Awaited Return to the Memory Businessanon2013/04/24 03:24 AM
        Article: Intel's Long Awaited Return to the Memory Businessaaron spink2013/04/24 10:01 AM
          Article: Intel's Long Awaited Return to the Memory Businessanon2013/04/24 03:23 PM
  Article: Intel's Long Awaited Return to the Memory Businessanon2013/04/23 05:56 PM
    Article: Intel's Long Awaited Return to the Memory Businessp.asta2013/04/24 09:13 AM
  Article: Intel's Long Awaited Return to the Memory BusinessVogel2013/04/24 06:07 AM
    Article: Intel's Long Awaited Return to the Memory Businessp.asta2013/04/24 08:57 AM
  Update: High frequency linkDavid Kanter2013/04/28 11:08 PM
    Update: High frequency linkGabriele Svelto2013/04/29 04:56 AM
      Update: High frequency linkAlbertH2013/07/10 04:21 PM
  Article: Intel's Long Awaited Return to the Memory BusinessMr. Camel2013/05/01 01:12 PM
  Haswell DRAM DIMM latencyAlbertH2013/07/10 04:37 PM
    Haswell DRAM DIMM latencyEduardoS2013/07/10 05:08 PM
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