I successfully got the multiplier up to x20 for 4.0 GHz. While running Prime95 I got an unexpected result failure so I rebooted and up'd the voltage by a step. Rerunning Prime95 made this go a bit more than last time but still failed so I upped the voltage another step and reran again which seemed to go a bit longer than before.
I'm just curious if this is the right process I should be doing before I harm the chip. At what point do I start messing with northbridge multiplier and voltage and other settings?
I'm no expert but I've been OCing this same CPU this week. Watch some videos on YouTube. 4.0MHz isn't an OC for this processor, you are basically just turning off the turbo and down clocking it as Turbo will take it to 4.1MHz.
I've read that you don't want to take the CPU voltage over 1.5v on this CPU, I haven't needed to take it above 1.35v and got to 4.4MHz. But yeah, watch some videos on OCing AMD and read up some more.