The graphics settings in FS does affect the power drain. When I turn the FS graphics down to medium or high then the PC does not shut down. With a i9-11900K, RTX3090 and FS ultra settings, a 850w PSU is pushed just beyond its limits. I have spoken to Scan PCs, and they agree the PSU is more than likely causing the shutdown. As long as I am not planning any upgrades, they recommend a 1000w PSU. Cleaning all the fans, increasing fan speeds, clean off the thermal past on the CPU and apply a fresh generous coat of thermal paste. The CPU thermal paste becomes less affective over time. That should cure the PC shutdown problem.
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