Stability Issue (large FFT) - e6300, DS3, OCZ pc6400 Platinum

[peleejosh]

System is 10 hours small fft orthos stable and multiple runs of super pi 32M stable. Games are stable, but havent had any extended (> 3 hours) sessions.

Can't get past like 20 minutes of Large FFT orthos? It fails everytime.

Temps are 46 load.

Chip is @ 2.8, Fsb is 400, ram is set to 5-5-5-15 and + .3v. All stock volts on everything else.

Any ideas?

UPDATE:
Put new Corsair PC6400 5-5-5-12 Ram in and it is stable now. Must have been the ocz ram.