Super PI the 4m test is another good quickie test to check stability. And don't set your ram as low as it can go, just go until you hit some instability, and then set a divider, or set a divider first if you want to be sure. You should be able to get it upper 3's if not low 4's, looks like you have a pretty good oc going for now. Go a little easy on your ram right now, but not 100MHz until your cpu is as far as you want it or it will go, then play around with RAM frequencies and timings. Oh and when you are done with your OC post a Super PI 1M time, if oyu would, should be pretty fast, my Sandy hits about a 32 sec Super PI 1m but some core 2s hit under 10s. It can be affected by your ram alot though, so make sure your timings are as tight as they can be and your frequencies are high. BTW in the end run Prime 95 at least overnight, as well as Memtest when you are done OC'ing to check for stability.