Here is a good article done by PcPer's Allyn Malventano on the AMD Ryzen CPU & the Windows 10 scheduler:
https://www.pcper.com/reviews/Processors/AMD-Ryzen-and-Windows-10-Scheduler-No-Silver-BulletThis testing work shows to clearly debunk the Win 10 scheduler bug issue (which is essentially the same scheduler as used in Win 7 & 8.1), but at the same time this work also clearly shows the potential advantages of using CPU priority\affinity to optimize this Ryzen 7 1800X 8-core CPU in particular AND also Intel's I7 5960X 8-core CPU when HT\SMT is disabled when running lightly\medium threaded apps (such as most games) on them.
Note in the comments section post-article of a Ryzen user who has employed the use of Process Lasso w\ the 1800X that he's using and the interesting outcomes that this user is posting..............will have to research into that.
This also shows that w\ the AMD Ryzen 7 8-core CPU's the real bottleneck w\ games running on them w\ SMT enabled is the latency penalty incurred thru Windows scheduler switching threads across CPU cores that span across the CPU core CCX modules w\ SMT enabled......NOT across the individual CPU cores themselves within a CPU core CCX module w\ SMT enabled. In fact, the AMD Ryzen 7 1800X CPU cores themselves exhibit much better latency results w\ SMT enabled than Intel I7 5960X CPU cores do so once the CCX crossover latency issue is improved\resolved the AMD Ryzen 7 CPU's should show a much different outcome in gaming performance....for the better.
Note: If you also look closely at the testing on the Intel I7 5960X CPU this same potential is there to be had as well by disabling HT then applying CPU priority\affinity, even though the overall structure that Intel has used w\ the I7 5960X shows better overall latency performance vs AMD's Ryzen 7 1800X as currently configured when HT\SMT is enabled running lightly threaded loads under Win 10......until you take it down to the individual CPU cores themselves....
Testing using heavily threaded loads shows that this CCX module crossover latency issue pretty much goes away as Windows 10 scheduler tended to not switch threads to CPU cores across the CCX modules but kept them to the CPU cores within each CCX module (much like as in a NUMA model CPU)......thus Intel I7 5960X was beaten handily as then the Ryzen 1800X's superior CPU core latency performance came to bear....
Or you can get this performance right now w\ AMD Ryzen 7 CPU's if you disable SMT then apply CPU priority\affinity as needed to optimize said game threads & eliminate the CCX module crossover latency issue w\ a little CPU core OC thrown in if\as needed.......
This would be the configuration in which I'd use it..........thus why I posted earlier in this thread that I was more interested in an AMD Ryzen 7 8C\8T CPU on an X370 platform.............
From my testing w\ my Intel 6-core CPU I'll wager that you won't need to physically mess w\ the CPU clock speeds as well. I've found that once the CPU core usage on a multi-core CPU that has more than 4 physical CPU cores on die (both CPU priority\affinity) is optimized for the intended app to run optimally the CPU core clock speed was shown to not be near the influencer as once the GPU is fully & consistently fed the data needed for it to operate fully across all dimensions any extra CPU clock speed above this threshold was shown to be nothing more than a waste of power\energy for no extra performance gain. From finding this out I have reset my I7 5820K CPU back to the Auto sets in the UEFI (base 3.3Ghz-Turbo 3.5Ghz). I don't see any of this changing w\ these octa-core CPU's whether it's an Intel or AMD Ryzen CPU............
Here's a WCCFtech article where a reviewer did something w\ a Ryzen 1800X CPU where it was reconfigured into a 4C\8T configuration then tested against an Intel I7 7700K CPU w\ both CPU's set up to achieve a clock-to-clock, IPC-to-IPC, core-to-core test to try to get a look into what AMD would be coming to the table w\ the AMD Ryzen 3 series CPU's against Intel's I7 7700K Kaby Lake CPU:
http://wccftech.com/amd-ryzen-4-core-benchmarks-intel-core-i7-7700k/The work shown in these 2 articles has pretty much helped to validate the direction where my next platform upgrade is going........and all I'll need is a mobo\CPU combo..........for a LOT less money but no loss of performance!
