memtest86 tests to choose

I was wondering what are the best tests to run in memtest86 for ram staility?

I left it running for 2.5 hours and it was still going, and i got bored and cancelled it after that as ram was stable

test #5 is the most stressful on the ram.... you should run them all, but the #5 test is the most harsh.... if your ram can pass a good number on the #5 test (I usually go through 20 reps when trying to find my max) then you have a good measure of stability....