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AMD CPUs tend to have more memory bandwidth than Intel CPUs and inference is CPU bound, so their claim seems accurate to me. Whether the core does a 512-bit wr
by ryao 1y ago
AMD CPUs tend to have more memory bandwidth than Intel CPUs and inference is CPU bound, so their claim seems accurate to me.
Whether the core does a 512-bit write in 1 cycle or 2 because it is two 256-bit writes is immaterial. Memory bandwidth is bottlenecked by 64GB/sec per CCX. You need to use cores from multiple CCXs to get full bandwidth.
That said, the EYPC 9175F has 614.4GB/sec memory bandwidth and should be able to use all of it. I have one, although the machine is not yet assembled (Supermicro took 7 weeks to send me a motherboard, which delayed assembly), so I have no confirmed that it can use all of it yet.
- adgjlsfhk1 1y agoyou can use higher write bandwidth than the CCX bandwidth by having multiple writes that go to the same L2 address before going out to RAM
- ryao 1y ago> inference is CPU bound This was a typo. It should have been “inference is memory bandwidth bound”.
- menaerus 1y agoInteresting design. 16 CCDs / 16 CCXs / 16 cores. 1 core per each CCD. 1 CCX per each CCD. With 512MB of L3 cache this CPU should be able to use ~all of its ~10 TB/s of L3 MBW out of the box. How much is it going to cost you to build the box?