i used intel burn test 10 times and passed both with stuff disabled (eist, C1, etc.) and with enabled like during normal usage. that seems to be the most brutal test and doesnt take 24 hours like prime95. I had previous oc setup pass prime95, and fail intel burn test, so i re-did settings to pass burn test. i like burn test the best.
i have not figured out how to do the memtest yet. I will this weekend, it requires to make some boot disk and stuff, but im lazy.