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Server chips These chips are great. You get a lot of cores, without having to compromise on frequency (you get high frequency as well). I wish cloud / dedicat

Server chips These chips are great. You get a lot of cores, without having to compromise on frequency (you get high frequency as well). I wish cloud / dedicated server providers sold these chips. Because most workloads need higher frequency than more cores. And you get the best of both with these.

AnthonyMouse 3y ago
They pretty much have this, e.g. EPYC 9274F has a 4.05GHz base clock. Threadripper with the same number of cores is 4.2GHz, which is less than 4% faster (for a >9% higher TDP). Threadripper has a significantly higher boost clock, but that only counts when you're not using all the threads, so you only care about this in a workstation running mixed workloads. In a data center you don't use a high core count processor for a single-thread performance-sensitive workload, you put it on something with fewer cores like a Ryzen 7700X because it has a higher boost clock than any Threadripper while costing less and using less power.
- tiffanyh 3y ago
  Are threadripper just the rejected high frequency “F” Epyc chips?
  - AnthonyMouse 3y ago
    The CCDs might be the same but several of the Threadripper models have to be "perfect", e.g. the 7975WX has 32 cores from 4 CCDs: https://www.anandtech.com/show/21092/amd-unveils-ryzen-threadripper-7000-family-zen-4-for-workstations-and-hedt https://www.anandtech.com/show/21092/amd-unveils-ryzen-threa... EPYC 9334 has the same config, but it's clocked lower and has a correspondingly lower TDP. Whereas the 7965WX has 24 cores from 4 CCDs, so the 7965WX is presumably made of CCDs where 2 of the 8 cores were defective, i.e. it's a 7975WX made of "defective" CCDs. But so is the EPYC 9254. Or they could have used the same four "defective" CCDs to make a pair of the 12-core Ryzen 9 7900, or four of the Ryzen 5 7600. The EPYC "F" processors are apparently made entirely of "defective" CCDs, presumably because it gives them more L3 cache per core and helps with heat dissipation by spreading the heat load across more CCDs for the same number of cores.

AnthonyMouse 3y ago

They pretty much have this, e.g. EPYC 9274F has a 4.05GHz base clock. Threadripper with the same number of cores is 4.2GHz, which is less than 4% faster (for a >9% higher TDP). Threadripper has a significantly higher boost clock, but that only counts when you're not using all the threads, so you only care about this in a workstation running mixed workloads. In a data center you don't use a high core count processor for a single-thread performance-sensitive workload, you put it on something with fewer cores like a Ryzen 7700X because it has a higher boost clock than any Threadripper while costing less and using less power.

tiffanyh 3y ago
Are threadripper just the rejected high frequency “F” Epyc chips?
- AnthonyMouse 3y ago
  The CCDs might be the same but several of the Threadripper models have to be "perfect", e.g. the 7975WX has 32 cores from 4 CCDs: https://www.anandtech.com/show/21092/amd-unveils-ryzen-threadripper-7000-family-zen-4-for-workstations-and-hedt https://www.anandtech.com/show/21092/amd-unveils-ryzen-threa... EPYC 9334 has the same config, but it's clocked lower and has a correspondingly lower TDP. Whereas the 7965WX has 24 cores from 4 CCDs, so the 7965WX is presumably made of CCDs where 2 of the 8 cores were defective, i.e. it's a 7975WX made of "defective" CCDs. But so is the EPYC 9254. Or they could have used the same four "defective" CCDs to make a pair of the 12-core Ryzen 9 7900, or four of the Ryzen 5 7600. The EPYC "F" processors are apparently made entirely of "defective" CCDs, presumably because it gives them more L3 cache per core and helps with heat dissipation by spreading the heat load across more CCDs for the same number of cores.