If you cpu cannot run bc2 without crashing at 3.65 it isn't stable, if it works at 3.5 then it is.
As for the op, well, lockups that windows doesn't notice tends to be a total crash. I had this problem one in a blue moon in tf2 with an old p35 board although I never succeeded in tracing it because I could never reproduce it. I'm certain it was the OC though as it cpu clocks were reset to default after a hard reset and the problem disappeared when I swapped a p45 board in so I assume it had do be either the cpu or mobo.
Pushing multiple Pi instances to 256M decimal places (so 1Bil error check numbers) through the cpu is one of the largest error checked calculations you can make it do and for 15min, it's worth a shot
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As for the op, well, lockups that windows doesn't notice tends to be a total crash. I had this problem one in a blue moon in tf2 with an old p35 board although I never succeeded in tracing it because I could never reproduce it. I'm certain it was the OC though as it cpu clocks were reset to default after a hard reset and the problem disappeared when I swapped a p45 board in so I assume it had do be either the cpu or mobo.
Pushing multiple Pi instances to 256M decimal places (so 1Bil error check numbers) through the cpu is one of the largest error checked calculations you can make it do and for 15min, it's worth a shot
