AMD "Thuban" Core (Phenom II X6) XS Overclocking Charts

[BETA.]

If it can do 4GHz at 1.55V, I'd say you're fine. If you're asking if I think you should buy a second one, that's up to you. Personally, with a result like yours I'd probably just run with it. If you're asking if I think you should exchange it for a different one, absolutely not. That would be unethical to exchange it because it won't overclock enough when it is functional at stock.

Well, it just passed it's 7th hour of prime, small fft's, and once it passes through the 10th hour i'm gonna call it "stable enough". After that, i'll start to tinker with other settings to see if I can lower the Vcore

I believe my CPU PLL is set at 2.5v stock. Maybe its your PLL voltage thats holding you back.

I have read many OC guides across many enthusiast forums around the net via google search, lol and many of these guides actually say to lower CPU PLL in some cases. It worked for me with my Intel i7 rig, so I just tried pulling the PLL with this one. I'm a noob at AMD OCing, so I could be totally wrong on doing this.