Are you certain? I was trying to figure out why folding on even a few CPU (2700x) cores was harming my GPU (RTX 3080) folding PPD notably. I realized the issue seemed to be that having multiple cores running at 100% was causing some CPU thermal throttling, lowering clock speeds, and so single-thread performance. There were still many open cores/threads with 1-5% utilization to feed F@H data. To confirm, I used Ryzen Master to do nothing but change all-core clock speed from AutoOC to either 4ghz fixed or 3.5ghz fixed. There was notable GPU PPD degradation when switching from 4 to 3.