3 ms·
Ryzen still stuck at SSE instruction. AVX2 instructions are faked and go at SSE speed. [EDIT - removed AVX-512 claim that was wrong] Overall perf is likely a
by gameswithgo 8y ago
Ryzen still stuck at SSE instruction. AVX2 instructions are faked and go at SSE speed.
[EDIT - removed AVX-512 claim that was wrong]
Overall perf is likely a lot better with the i9 for most workloads.
- jsheard 8y agoThe i9-9900k does not support AVX-512, since it's still based on the Coffee Lake uarch. ARK confirms: https://ark.intel.com/products/186605 https://ark.intel.com/products/186605 It's true that Coffee Lake has a performance edge over Ryzen when running AVX/AVX2 code though.
- floatboth 8y ago"SSE speed" is the most meaningful term I've ever seen. Ryzen doesn't have 256-bit wide units, so 256-bit instructions take 2x as long. The benefit of that is that Ryzen doesn't throttle the clock speed of the whole chip when executing AVX2 instructions :P Intel's widening of units has brought a giant downclocking problem: https://blog.cloudflare.com/on-the-dangers-of-intels-frequency-scaling/ https://blog.cloudflare.com/on-the-dangers-of-intels-frequen...
- floatboth 8y ago(least meaningful of course)