I have corsiar xms2 pc6400, and I am currently very stable at 426X8, with mem running at 852mhz. Seems that I can't hit 3.5ghz without increasing the vcore alot. I have tried quite a bit for 500X7 with memory at 1:1 ratio, very slack timings. I can run dual prime and get no errors, but sometimes my comp just restarts.. can't figure out what is causeing this, I figured it was vcore, but I tried with 1.4 vcore and it still wasn't stable. Any idea's what would causes a reboot? but no errors?