F@H: big folding performance reduction when slightly decreasing CPU freq

[oaaya]

I've been running F@H for almost a month now on a 9900K + 2080. The CPU is set to 4800MHz on all cores.
Until recently I was succesfully folding and getting around 2M points and 20-30 WU's daily.
Recently it got a bit warmer round where I live so, due to more frequent BSODs, I've dropped the CPU to 4700MHz. This is the only change I've made.
It's since stable, but my daily points and WUs have dropped about ten-fold.
Why such a big reduction?

I've tried to find and answer in this forum and elsewhere, but failed. Apologies if it's something obvious, but I'm really curious why this is happening.
Thanks in advance.

[Windows9]

I may be wrong, take my advice with a grain of salt, but maybe the its something to do with the memory timings

[oaaya]

9 hours ago, Windows9 said:

I may be wrong, take my advice with a grain of salt, but maybe the its something to do with the memory timings

I can't say yes or no to that, though I've just used auto timings since day 1. No XMP profiles, no manual memory settings.
What makes you think it will make such a big difference in this situation?

[Windows9]

2 hours ago, oaaya said:

I can't say yes or no to that, though I've just used auto timings since day 1. No XMP profiles, no manual memory settings.
What makes you think it will make such a big difference in this situation?

I assumed it was something to do with the memory timings and CPU frequency. Try posting on the f@h forum, they have more knowledge

[oaaya]

Thanks. I've fiddled with some setting in the F@H client itself and will leave it on for now and observe if it changes anything. Estimated PPD looks more promising now but time will tell...

[LazyDev]

Faster the CPU, more work gets given to the GPU. This could also be the project that the GPU is working on.

[rkv_2401]

A ten-fold performance drop would be from 2 million PPD and 20-30WUs to 200,000PPD and/or just 2-3WUs. If something that significant has happened, assuming you were able to get WUs consistently, it could be because your system has been dropping WUs due to instability errors without you noticing. Have you checked the logs? Also, how has it worked out now?

[oaaya]

I've not dived into the logs (I look at logs all day in my day job...not really something I'd like to spend my private time on) but the performance has been much better since I've set the client to use 11 cores, instead of default -1.
Since then I'm back at 2M PPD and it's been stable. If the problem resurfaces I'll investigate more thoroughly.
Thanks for the suggestions!