So I've been running my pc at 250fsb for a while now. Completely stable of course, so yesterday I spent the day trying to push it further. I was running fine at 270 and then started getting some IRQ errors. All the settings I could think of were correct. LDT at 3x, memory kept close to 200 at stock timings, voltages bumped up a bit. What else is keeping me from getting a stable overclock? I thought, maybe the AGP Lock. Its supposed to be flaky on the AV8. So I used a 8:2:1 Ratio, and no help. Unfortunatly, 8:2:1 is the highest ratio available. What else could I try?