EPoX 9NDA3+ S939 nForce3 Ultra
 

280MHz driven clock is above average for an nForce3 Ultra board. Dropping the multiplier to 8x didn't improve stability beyond 280MHz, suggesting that the sample's ceiling had been breached. 280MHz, however, was as solid as the proverbial rock.

http://www.hexus.net/content/reviews...mlld19JRD05Mjc



Something tells me that they had either a bad sample, or bad CPU:)
http://www.madshrimps.be/forums/show...5573#post85573