Go into the bios and the advanced section.
cpu configuration - set Intel SpeedStep to disabled
AI Tweaker section - AI overclock to manual (this will reveal a couple other settings mentioned below)
- cpu ratio setting to 9.5 (doesn't list that in manual, but that's the E8500 multiplier)
- FSB frequency to 358
- PCIE frequency to 100
After you set the fsb frequency, the dram frequency will change. You can then set it to where you want, I usually go closest to the rated speed of the ram. This is to set the ram divider, some boards make you put in an actual divider, such as 1:1, 3:5 or something similar. Your bios should do the math for you, and you just need to select the final result.
The cpu frequency is the bus speed times the multiplier.
358 x 9.5 = 3401Mhz.
At 3.4Ghz, everything else will be fine on auto. You'll need to stress test and make sure that you arent' going to overheat and that it remains stable.
Some progs you'll want.
cpu-z to look at things like cpu speed, lot of good info on other stuff in there too.
http://www.cpuid.com/cpuz.php
Something to keep an eye on the temps. I use RealTemp for that. If your temps go above 63C. at any time, stop the test, it's time to redo your thermal paste and/or get a better heatsink.
http://www.techpowerup.com/realtemp/
And a stress testing prog like prime95 to run your cpu at 100%, if no errors or overheating after 8 hours, your OC will be considered "prime stable".
http://majorgeeks.com/Prime95_d4363.html