My computer finishes a 10^21 3.09 task in about 100 seconds (RTX4090, nothing overclocked). But after a few hours it jumps to 300 seconds consistently. After a reboot it's back at 100 seconds per task.

Any ideas? Is there a method to reset other than reboot?

Thanks.

Interestingly I am seeing the similar behaviour. I sometimes have tasks that will run for over 3 minutes.

I get around this problem by simply suspending then resuming the task in Boinc manager (if I happened to notice tasks are running longer than around 1 minute 40 seconds)

I am running my card at 320 Watt. I didn't notice a reduction in time running it at 450 Watt

Curious. Are the 4090's connected to a monitor?

100 sounds about right for a 4090. My 5060 Ti's are finishing as fast as Speedy's 4090. I get a variety of times with my 4060 laptop depending on what else it's doing.

Speedy has increased his/her kernel to 23 so that's good.

Interesting how my 4090 is matching a 5060 TI in terms of runtime. I must say you have an impressive RAC

Yes I am running 1 monitor off the card

Dumb luck stumbling onto MSI ventus cards. I haven't seen anything faster in each class.

I use the IGPU so the MSIs are dedicated to crunching.

I have used MSI Ventus desktop 3080 card before and found really good.