Think I have a bad or incompatible RTX-3070.
RTX-2080 went dead in a Win11 gen3 express system (Area51) and Gigabyte replaced it under warranty with RTX-3070. They did not have any more 2080
I observed the following problem briefly discussed over at Boinctasks

All my CPU tasks are running at less than %50 utilization.
The top 6 Universe were run on an i9-7900x at 3.3ghz
The bottom Universe on an old Xeon x5650 at 2.67ghz and complete 2x as fast as the i9 cpu.
All CPUs were allowed %100. There is no thermal throttling. The previous system with RTX2080 the CPU was always %100 busy
Either the graphics board is defective or the gen4 express is causing problems in a gen3 system.
The GPU tasks runs fine, just a problem with the CPU utilization.

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Problem is the CPU / Motherboard or recent BIOS upgrade / Windows 11 feature update that all happened over a 2 day period

The problem was not the GPU.

finally got a handle on the problem. i booted windows 10 and the system worked fine
Problem was the 22H2 update to windows 11
Googling "22H2 slowdown" brought up a motherload of complaints

I put the win11 drive back in and I and tried every suggestion that google dished up but was stuck at under %50 utilization no matter what option I enabled or disabled. It has been 10 days since 22H2 went in so no easy way to get back to when the system was working. All windows 11 recovery points are after 22H2. Going to beg on answers.microsoft.com. This system is old but was qualified for windows 11