Just lost 2 bigadv's in a row at 92% and 87% over the long weekend.

Four days of wasted power.
Fired up prime95, no issues, 9 hours of memtest86+ gave me nothing. Saw some guys here using HCI memtest so I gave it a shot, I got 1 error after 5 hours of 8 instances...
Any better recommendations for stability testing? Also, has anybody used the paid version of HCI? I personally hate booting into Windows for testing.