50 loops of IBT is crazy. Your only going to kill hardware doing that.
10 loops 20 tops, then a nice prime run will more than suffice anyone.

BTW I have passed 15 loops of IBT and failed Prime in under a hour so to say IBT is the great and all powerfull stress test is rather bold.
PPl's version of stable vary, 10 loops IBT and 8-12 hours Prime and its rock solid imo
This board is easy once you learn how YOUR hardware behaves with the bios tweaks