Moved the video card. Fixed.

3.96 secpmds 530.96 MPx/s

Another happy camper!

Thank you for the help.

You've given me the hint I need. I have the GPU in the 2nd slot for clearance reasons, but on my MB, Asus x570 Prime, that slot seems to only run at x4, even though it's labelled a x16 slot. Go figure. I'll re-arrange things later today and try again.

New(ish) user here. Just ran benchmarks, which seem pretty slow for my rig: 7.17 seconds, 293.4MPS, with a GTX 1660 Super on a new Ryzen 3600 build. Speed seems to not change even if I turn off OpenCL acceleration.

Thoughts?