Below is my system. Whenever I try to up the multiplier in the BIOS for a mild overclock (3.2 to 3.7), anything above 3.6 will crash when I load BF3. I think it's either my lame mobo or insufficient PSU. The temps are really good I think, ~20C idle and in the 30s when gaming. What do you guys think? What kind of overclock should I expect from this proc with my cooler?
Phenom II 1090t @ 3.2 stock
Coolermaster Hyper 212 Plus
2x2 GB DDR2
2x ATI 4870 1GB in crossfire
Asus M4A78 Plus AM2+ mobo
Corsair 650w PSU
I also do not know much about AMD overclocking either, but ...
Your power supply is not your problem. Under full load, your system will not pull more than about 450 watts and you have a better than average PSU.
IF you run Prime95 to stress test your overclock, what are the results in the Prime95 small fft's test and the blend test? Small fft's primarily tests the CPU. the blend and large fft's tests work the memory harder. This is how you can get an indication of what may be wrong.
Next, I think you may not be monitoring your core temps properly. Generally, idle temps run about 5 - 10 C above ambient air temps (usually room temperature).
Just FYI, there are a lot of stickies on the web (and on these forums) that discuss how to overclock. It would be in your best interest to search for them at the top of applicable forums or ask where you can find them. Google searches always work wonders...