4 ms·
I wonder how this compares to the 7950x3d. So much cache and a high boost clock. https://www.amd.com/en/products/processors/server/epyc/9005-series/amd-epyc-917
by Salgat 2y ago
I wonder how this compares to the 7950x3d. So much cache and a high boost clock. https://www.amd.com/en/products/processors/server/epyc/9005-series/amd-epyc-9175f.html https://www.amd.com/en/products/processors/server/epyc/9005-...
- Tuna-Fish 2y agoGreat if you have 16 independent workloads, terrible for things that care about communication between threads. It has 16 CCD, each with only one thread enabled, latency between CCD is ~150ns.
- justmarc 2y agoSurprise surprise, not every tool is right for every job.
- menaerus 2y agoNot sure if this comment was about to come out as snarky but the parent rightfully pointed out the not so obvious design of EPYC CPUs. CCD is a NUMA in disguise.
- tryauuum 2y agoNot in disguise, there's a setting in BIOS, if you set NPS4 + L3 cache as NUMA domain then each CCD will be visible from OS as a separate NUMA node
- smolder 2y ago150ns is actually surprisingly high! I didn't realize it was so bad. That's about 2-3x as much latency as fetching from DRAM based on what I see in peoples AIDA64 results.