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Depends what you use your pc for....by running one instance is only using one core so the other is not being used that's why you should run two...and change it to small fft's to stress cpu....if it does happen to crap out just give it a little more vcore but watch those temps....if it's getting to toasty i would not let run overnight you might wake up to a nackered pc....so take care....remember you got nothing to prove to no one here....it's totally up to you