Hey guys,

I'm currently running a Ryzen 3700X and a 1080 Ti.
The 1080 Ti needs around 100 seconds for one Separation WU.
I had a 1050 Ti lying around and did some testing with two GPUs.
When BOINC is running two GPU WUs the 1080 Ti needs 120 seconds to finish one WU.
When I stop all the parallel CPU WUs it's back to 100 seconds.
I'm trying to understand what the limiting factor is?
It's running 14 CPU WUs and the two GPU WUs, which should be fine.

Cheers

You need to leave a couple of cores free for the operating system.
Restrict boinc to use only %90 or so and look in the event log to see how many CPU were freed.

Thanks, I tried your suggestion and it dropped from 16 to 14 cores, but the runtimes were still identical.
I then stopped all CPU WUs and it still didn't improve.
I noticed in HWiNFO that my clock is only 1.500 Mhz.
Once I closed Brave Browser it increased to ~ 2.000 Mhz again.
With Brave closed all is fine... very strange.

Sounds like the OS task scheduler thinks it is smarter than you and sees the Brave browser session as high priority and shoves the BOINC processes down into low priority dropping the clocks.

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Thanks, I tried your suggestion and it dropped from 16 to 14 cores, but the runtimes were still identical.
I then stopped all CPU WUs and it still didn't improve.
I noticed in HWiNFO that my clock is only 1.500 Mhz.
Once I closed Brave Browser it increased to ~ 2.000 Mhz again.
With Brave closed all is fine... very strange.

Try FireFox, yes I know why you use Brave browser instead, just try it and see what happens. You can try Google too but it's a memory hog.

It didn't happen with Firefox

It didn't happen with Firefox

Then the problem is the Brave browser and the way it interacts with your gpu, and probably everyone elses as well just maybe not as much, you need to decide if you can live with it and keep using the Brave browser or stop crunching while using the Brave browser.