I've got an AMD Phenom II X2 unlocked to X4 and I'm using AMD's Overdrive tool to overclock the cpu from 3.3-3.5ghz. All I did was move the multiplier a 1.0x step up and changed the voltage from 1.420 to 1.435. I'm using a stock heatsink, so is this OC safe? I know its only a small incease but I wanted to make sure it would be fine on the stock heatsink.
Also, the overdrive tool shows my CPU temp at a constant 12 degrees celcius even during the stability test and when running games. Is this normal? It seems way too low.
You shouldn't need to bump the voltage for a single 200MHz increase, and those voltage numbers seem high, my 955 is only at 1.35V.
Also, a temperature of 12 C is wrong, your CPU must be above ambient(room) temperature unless you have an exotic cooling solution in place, download HWMonitor and use that to check the temperatures, if that reads the same i would check in BIOS to confirm that your CPU can read it's own temperature correctly, idle temps should be in the 30's
When I had first gotten my Phenom II X4 955, I overclocked from 3.2Ghz to 3.4Ghz with the stock cooler and stock voltages I think you shouldn't really have any problems for your particular CPU as well.