Ok, so here it is, my frustration with my lack of knowledge! Got an Asrock 939 dual SATAII, X2 3800, 1 gig Corsair pc3200 and can only get a measly 2.3Ghz, anything more (2.4) and it fails to boot into windows. I set the RAM to 133Mhz divider, chanded to cpu, pci-e, Async in BIOS, increase the cpu freq to 240, set cpu NB link speed to 800mhz and voltage at max 1.4V. I'm not after a huge OC but know that everyone else can get so much higher. I've set the above in BIOS from other threads i've read of the same cpu/mobo combo, but i know sweet fudge about how it really works... only got a basic understanding... so if anyone has any suggestions that would be great Oh HSF is Gorb2 and temps are a nice 32C idle and a max of 43C load thus far, so i kinda ruled out temps being a problem.