fishbaits: Jayztwocents Ryzen build.
https://www.youtube.com/watch?v=SE4sxXva9Eg It's been shown that something in win10 is hampering Ryzen processors, so guess folk'll still have to wait a few weeks to see if micro$oft release the drivers.
Win7 on the other hand, isn't hampered.
https://forums.anandtech.com/threads/ryzen-strictly-technical.2500572/page-8#post-38775732 I did some 3D testing and eventhou there is not nearly enough data to confirm it, I'd say the SMT regression is infact a Windows 10 related issue.
In 3D testing I did recently on Windows 10, the title which illustrated the biggest SMT regression was Total War: Warhammer.
All of these were recorded at 3.5GHz, 2133MHz MEMCLK with R9 Nano:
Windows 10 - 1080 Ultra DX11:
8C/16T - 49.39fps (Min), 72.36fps (Avg)
8C/8T - 57.16fps (Min), 72.46fps (Avg)
Windows 7 - 1080 Ultra DX11:
8C/16T - 62.33fps (Min), 78.18fps (Avg)
8C/8T - 62.00fps (Min), 73.22fps (Avg)
At the moment this is just pure speculation as there were variables, which could not be isolated.
Windows 10 figures were recorded using PresentMon (OCAT), however with Windows 7 it was necessary to use Fraps.
No idea how PresentMon hits processors, but I know Fraps does tend to hit them hard.
Wow, interesting. This combined with the BIOS version problems of AM4 boards sent out to reviewers really seems to have put performance into a state of doubt. I also recall AMD recommending using GPU / CPU (not sure which) bottleneck during testing to reviewers.
Did you do all four benchmarks with SMT on? Also, what is 8/16T/C? Total War is also a gem in the fact that something is always wrong with it, especially the ones in the Empire TW engine. I recall getting strange framerate issues in Rome 2 because of a camera minimod in my Shogun 2 mod folder.