got a crucial ballistix PC3200 DDR and set vdimm to only 2.7 (2.8 doesn't improve my OC). my timings are 2.5-2-2-10 (it can work at 2.5-2-2-5 but i think my settings give better real world performance) the ballistix chips are based on the 3500/3700EB OCZ chips so they are the best chips for A64 OCing. My vcore is 1.55 only so that I am assured my CPU is not undervolting. otherwise I am trying to get it to 2.6 or 2.65 (they run but has some slight instability) at 2.6 or 2.65 you'll need a ram divider though since the Ballistix memory tops at around DDR 520 (260FSB) even if you relax the timings. I only tried 2.8 max vdimm coz I am conservative) hope it helps!!