I am curious though since I can see frequent spiking of GPU usage including memory but not memory voltage even under idle conditions if that's part of it but then that wouldn't explain the situation for those crashing (Black screen and forced reboot.) when the GPU is under load and it's getting the power and such needed. Unless the spiking clock speeds are part of it outside of the PSU's hitting a surge protection when it's doing a sudden power draw or having inferior cabling. (1x 8 to 2x 6 might work otherwise but not at that power draw hitting at least over 300w somewhere.) But those also happen when Wattman isn't used at all or even when the GPU is downclocked, undervolted or a combination of undervolt and underclocking or even setting a higher voltage level to see if that works so again it's just questions but nothing really definitive for a answer. Spiking also happens on Vega and VII now possibly Polaris too so that is important as well if the GPU suddenly goes above stable speeds even when Wattman isn't used at all but since the rest doesn't help then it's not a answer either. Plus the situation where some titles just crash at random shortly after starting them up or just immediately on start though that's usually just a application crash and not something that takes the entire system down.