That means your overclock is no longer stable. My previous CPU was an AMD II X2 Regor 240. Best I could get it stable was about 3.542 (14x253), so I turned it down and left it at 3.5ghz(14x250). I wasn't hitting any thermal threshold either. So if your not having any heat issues, thats probably as best as you can get.
This chip wasn't designed to clock at that level on air. Unless your liquid cooling I'd scale it down to a more stable overclock. I'd recommend googling a stable overclock for that processor and maybe try adjusting those levels from there to achieve your desired performance level: http://www.overclockers.com/forums/showthread.php?t=679...
I would disagree. Unless he is on a stock cooler, he shouldn't have thermal issues. I didn't have thermal issues when I was running a Xigmatek Loki and certainly no thermal issues when I switched to a Noctua NH-D14. So if he is using a decent non-stock cooler, it can be overclocked on air. The chips wouldn't hit a thermal load that would merit the need to water cooling.