OC clitches and failures

[dae]

Hey everyone.

I've gotten my first heavily OC'd box up and running. It's more than stable when on Windows running anything (mp3's, video, benchmarks etc.) but when I head for games I usually end up in a crash after a while.

Now I know its not the gear. I've got AMD XP-M 2400+ with AquaComputer watercooling. I get to 40 centigrades when running the cpu on 12,5*200. RAM is 3200, no OC on it to prevent someweird stuff from happening. BUT benchmark runs fine. PiFast (with 500M decimals, as a stress test) runs OK, but try a game and I usually end up with IRQ_NOT_LESS_OR_EQUAL. What is this? AGP/PCI giving me a hard time, I dont even have anything else in the box except my Ti-4600 graphics card, not OC'd at the moment BTW.

[Jonny M]

Give the RAM / CPU some more volts.

[Steve]

What mobo you on? Are the PCI/AGP buses locked? I'm presuming it's NForce 2 and will be, as VIA chipsets (as I know too well) aren't good overclockers (well mine isn't.)