- Oct 14, 2003
When he says it's better, he's talking about 5%. Also they just said with Raptorlake release the 2-4% improvement with prefetcher and cache changes finally got it to Skylake level. Obviously even Skylake has 2x vector performance so they aren't talking about that.I'm going off Raichu's spec 2017? 2007? testing for IPC.
In Libx264 testing by ChipsandCheese, IPC for gracemont was ~75% of GLC. I believe he used a 12900k.
Gracemont's chief architect claims it has greater than skylake level INT IPC as well.
Can't find any more IPC testing of gracemont. From what I have seen, IPC difference for gracemont isn't as bad as 40-50%.
Vector performance is also a lot more commonplace in the server market IIRC.
Vector performance only matters in the HPC market. Rest of server is integer. Cloud services, Enterprise, web servers.
Also Intel's talking about wide range of applications, not just one single benchmark. It's 40-50% just based on their own claims, which many benchmarks prove.
Real client vector code is a fraction of the total thing. Doubling that won't get you more than 5-10%. I challenge you to find client benchmarks that show big differences with AVX. You can see from Skylake-X benchmarks that you can find maybe 1-2 benchmarks. Anand's only test that shows a big gain is pretty much synthetic code that Ian himself coded.