First of all I'd like to acknowledge/credit DHP, blackosx, flAked and THe KiNG without whose hard work this wouldn't have been possible.
Make sure you have the attached bios installed. This is hacked to allow CPU Power Management to work. REMEMBER: IF YOU'RE NOT FAMILIAR WITH FLASHING A BIOS THEN DON'T DO IT. I cannot stress this enough, making a mistake could trash your board
AI Overclock Tuner = Manual
Turbo ratio = By number of active cores mode
For i7 2600K (you'll need to get the correct settings for your CPU):
1-Core Ratio Limit = 38
2-Core Ratio Limit = 37
3-Core Ratio Limit = 36
4-Core Ratio Limit = 35
Internal PLL Overvoltage = Disabled
CPU Ratio = Auto
Package C State Limit=No Limit
Use Revoboot as the boot loader with the attached miniSSDT in /Extra/ACPI. Please read the Revoboot thread to find out how to compile this for your system, everyone's will be different according to their CPU/graphics card combo. You'll need to make sure:
You have correct efi-injection for sound to work.
You are using MacMini5,3 as model identifier
Have also attached ethernet kext (64-bit only) and sound kext.
EDIT 11/01/12: Have attached the new updated bios. All DSDT errors fixed, will run OSX natively without any .aml additions, nice boot graphics if you disable the splash screen, speedstepping fixed. Now I run i7-2600K air cooled and overclocked to 3.54GHz with turbo ratios 47,46,45,44. Geekbench 16600