yeah should really use the bios for most overclocking. My guide in sig can be helpful for simple overclocking although I dont have the uefi bios. Check the digi settings at the bottom for asus they might apply to newer giga boards (dont know for sure, let me know if they do
The only thing recommended to use AMD overdrive for is to disable APM/Turbo-core as sometimes this doesnt work correctly in the bios. this i believe only applies to rev 3 owners I think your bios has both apm and turbo core. both MUST be either disabled OR enabled at the same time (generally disabled). If your bios disables this correctly without causing throttling then overdrive IMO is useless.
You always want to go up one click at a time and make sure its stable through-out. Starting in the middle or towards the top will just cause headaches. Make sure your 100% stable stock with no throttling. Then push up slowly. Since you have an 8320 you can probably jump up to 4.0ghz and start there but make sure your stable before moving up slowly. Always start by disabling turbo core features + power saving features (few pictures in the guide).
LLC will also play a big role in overclocking. Must have this set to a proper setting before starting aswell. Understanding what LLC does and how to adjust it is important. Once LLC is set and you have everything else set to manual settings (auto can do bad things better to set to stock regular settings on every voltage if possible). The rest is easy.
Expect voltage walls. There are going to be some points you feel like you have too much but really you still dont have enough volts. You probably just need more. Vishera's eat volts. Don't be afraid to push it if you have good enough cooling.
2nd post thought:
Just noticed your using hyper 212. your max OC will probably be 4.5ghz at the MOST. Not recommended to exceed 62 degrees stay safe
Also I used the same cooler (mine was evo) on an 8350 and only got to 4.4ghz with an added case fan in pull. For some reason 8320 owners seem to see better results (or my chip sucks) but dont expect miracles
I ended up at 4.3ghz with one fan.Edited by dmfree88 - 11/3/13 at 2:16am