My Sapphire Pulse RX6600XT arrived yesterday and it's acting weird. When I lower the GPU voltage then it's crashing. When I enable the fast timing option then it's crashing. Either way, when I lower the GPU clock and power limit to -6%, and set 2250MHz memory clock (so far I was trying only up to 2250MHz) then it can make 32-33MH/s at 66W. Powercolor with lowered voltage runs at 32-33MH/s but 55W. There were no problems during the night so I guess that I can set the memory clock a bit higher.