I used to have a o/c wall at 350FSB with my old ram. But with my new Ballistix PC6400 ram, it does 470FSB at stock voltages, with the same settings.

So, I don't think, comrade, your Ballistix 5300 is the problem. Those are Micron D9 chips and probably the same chips that are on the expensive PC1000 modules (but perhaps binned?)

I would make sure your ram timings are at default (ram spd enabled in bios) when trying to o/c. You can tighten them later after you find your max. FSB.

At 400FSB, I think you may still be at the 2:3 ram divider, but at 401FSB and above, its 1:1, where it is much easier to o/c.

I would try 410FSB with the cpu voltage boosted to 1.45 volts, (which in reality may be only 1.38 volts, considering the vdroop of these boards.)

Then hopefully move your way up in 10FSB increments up to your max. o/c. Voltage will have to substantially increased to get above 490-500FSB. I'd watch your temps carefully for any sustained usage over 500FSB.

My system runs stably at stock voltages at 470FSB (Cpu 1.3875v in bios, which is 1.32v at the cpu), which equates to a 3.3GHz C2D. But this system was a dog with my old ram.

I reached 525FSB with the bios cpu voltage set at 1.55v, the memory voltage at 2.1v, and the FSBterm voltage at 1.45v maximum. All the other settings are on Auto. This o/c caused extremely high cpu core temps and other parts, I'm sure. But at 470FSB is cool, stock and stable.