I'd like to see the 9965 in action. These parts are crazy. Will definitely be lo...

Salgat · 2024-10-12T06:06:37.000000Z

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-...

Tuna-Fish · 2024-10-12T07:46:24.000000Z

Great 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.

smolder · 2024-10-12T19:42:55.000000Z

150ns 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.

justmarc · 2024-10-12T08:08:03.000000Z

Surprise surprise, not every tool is right for every job.

menaerus · 2024-10-12T09:17:33.000000Z

Not 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 · 2024-10-13T01:15:19.000000Z

Not 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