Ok, Changed out a 1080Ti and Seasonic 850W for a 6900xt and Be Quiet 1200 Pro. New kit into the rig, no issues with the water loop so booted up, everything was fine in desktop and 2D in general, however as soon as i went to game the rig just cut out completely, no BSOD, no back to desktop, a complete shutdown. So things id already done, complete clean of the NV drivers and install of the most recent Radeon drivers, Played about with voltages until ive settled on 2000mhz gives me a stable system for games and 3D benching progs. Temps no issue, never above 50C. Now for the bit I'm not 100% on and thats the PSU, i have 5 slots for PCIe cables and each cables has 2x8 pin connectors, I've tried using 2x8pin from the same cable and 1x8pin from two separate cables, neither allows me more than the 2000mhz. The normal MB 24pin is in plus the 8 pin, there is another 4pin and i also connected that up to the P8 socket on the PSU but that didn't allow me to go beyond the 2000mhz either. Before i put my old PSU back in to see if the issue is PSU rather than GPU, has anybody come across this issue before? Prior to the swap out the MOBO (Asrock 570 Taichi) has run flawlessly. Any particular voltages i need to check, Its the first AMD card ive had since my 9800Pro all those years ago, thanks in advance for any pointers.