You're quite right Cryptik, I've been trying to run before I can walk!

I was going by my o/c on the P5B-dlx and was just hoping I would be able to get near to that without having to do too much else, although it seems this beast needs to be well and truly tamed, particularly with quads.
I did manage to get around 5hrs prime blend stable after going down to 400FSB a few days back (i stopped the test), but notching up the FSB 1MHz at a time after this only resulted in the usual 10-minute reboots. It's the timing that gets me, reboots seem to happen within 3-15 mins of each test..makes me think something might be overheating

I'm also getting a few hung POSTS, along with 'DET_DRAM' and 'POWER_OFF' messages on the LCD occasionally too. I hear this might be related to a bad bios flash, so I'm going to attempt a reflash in proper DOS mode tonight.

Failing all that, I'll test at stock speeds again, and if that fails, it might be an RMA...I'm beginning to grow a tad suspicious of this board, even though I have some sentiment towards Asus products!

Thanks for the help already though, hopefully I'll make some good headway tonight... Wish me luck!