Post
Topic
Board Mining (Altcoins)
Re: RANDOM-X on XEON... CACHE, FREQ'S OR CORES?
by
wacko
on 11/03/2021, 16:10:42 UTC
Could someone explain why 10-core Ivy Bridge CPUs seem to show the same hashrates as the 12-core CPUs? I'm trying to pick processors for a couple of simple home servers (dual 2011), that I'd also use for mining while it's profitable, and looking at the benchmarks on the xmrig website - I'm confused. E5-2680V2 is a 115W TDP 10-core 2.8 GHz base that's supposed to hit 3.1 GHz all-core turbo, and E5-2696V2 is a 120W TDP 12-core 2.5 GHz that is also supposed to hit 3.1 GHz all-core turbo. So they look identical other than 10 threads vs 12 threads, but xmrig benchmarks suggest that they both only hash at ~ 5k each. I figured if the 10-core does 5k, then the 12-core should be about 6k?

Am I missing something here? I thought maybe 2696V2 doesn't reach the 3.1 GHz turbo during mining for some reason, and that's why it shows ~ the same hashrate as 2680V2 - cause the latter has higher base clock. But then I looked at the benchmarks of 2697V2 (which has higher than 2696V2 base of 2.7 GHz, but lower turbo of 3.0 GHz), and it's the same thing - also hovers around 5k per CPU. They're all 256KB L2 cache, 25/30MB L3 cache, yet extra 2 cores don't seem to bring any hashrate improvements? Is this a RandomX thing, or something with XMRig miner or benchmarks?