Server: Lenovo ThinkSystem SR 665 with two AMD EPYC 7H 12 in the test Cover open: The interior of the SR 665 CPU performance in comparison UEFI settings as a hurdle I / O surprise SAS versus NVMe Conclusion Read article in iX 2 / 2021 Under the name ThinkSystem SR 665 Lenovo does not offer a computer, but a construction kit. It is what you make of it – from the backup server with an eight-core AMD EPYC 7251 in addition to 320 TByte mass storage up to the supercomputer with two 7H 12 and 128 cores as well as three large or eight small GPUs. The only constants are the double high sheet metal frame, a motherboard with two sockets for AMD’s EPYC processors and the XCC management controller.

AMD makes it easy for Lenovo. The second EPYC generation can handle eight DDR4 channels with up to 3200 MHz and 101 Carry out PCIe 4.0 lanes, regardless of how many cores the chip has. This is made possible by the modular architecture with up to nine semiconductor dies on a carrier that is socket-compatible with the previous CPU.

The node is formed by an I / O die in 13 – nm production, so to speak the control center between the memory , the periphery and up to eight 7 nm core / cache dies (CCD), consisting of two Core CompleX (CCX) with four cores each and their own L1 to L3 cache hierarchy. Four cores share 16 MiB L3 cache. Each Zen 2 core with its two threads are 512 KiB L2- Upstream cache.

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