Well,I got my 3rd set of ballistix1066 from crucial 5 days ago and havent had a bsod or error yet.Memtest didnt report any error after a 4hour run either.However Im not sure if HWMonitor is accurate.It reports Im at 2.21.Easytune reports 2.15. I set my DDR2 overvoltage to +0.35 It seems stable for now and thats what matters.And the replacement I got is a different batch.Oh and just so you all know the crucial tech guy pointed the finger at the motherboard right away.I understand that maybe it could be a motherboard mem controller issue but he could have tried to help solve the problem instead of going on a rant about motherboards.Thanks to all of you that posted back over the past 6 weeks or so.My opinion.Go with ddr2(800mhz)to be safe.