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• #8600 S_x96x_S addikt

  Új Válasz 2023-02-10 22:27:14 #8600

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  STH: Why DDR5 is Absolutely Necessary in Modern Servers
  February 10, 2023
  https://www.servethehome.com/why-ddr5-is-absolutely-necessary-in-modern-servers-micron/
  - "In this generation, AMD EPYC 9004 “Genoa” officially supports CXL 1.1 Type-3 devices."
  

  Astera Labs Leo CXL memory expansion device.
  

  "As one can see, there are four DDR5 DIMM slots onboard and a PCIe Gen5 x16 connector on the bottom of the board. Using this device in a server yields bandwidth roughly comparable to two channels of DDR5 memory through the x16 slot. Latency is roughly the same as accessing memory across a coherent processor-to-processor link (e.g. CPU1 accessing memory attached to CPU2.) In systems, this shows up as another NUMA node without CPU cores attached but with memory attached. We are going to do a more in-depth piece on this.
  In this generation, AMD EPYC 9004 “Genoa” officially supports CXL 1.1 Type-3 devices. Intel’s Sapphire Rapids Xeons support all of the underlying protocols, and the card shown above works n Sapphire Rapids servers, we have seen demos for some time. Intel is just not supporting Type-3 devices at launch."

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