Welcome to PG.
Keep an eye on your CPU temperatures via something like SpeedFan or MSI Afterburner or HWInfo. For your machines you should find you are effective at 321 sv to start you off - you won't find any new primes this way as it is sieving, but it is nonetheless a valuable & quantifiable contribution. You can only do what you do & appreciate that. The LLR prime-finding projects will be more taxing but worth a go providing temperatures stay below say 70~80C.