We don't need ... you do.
With a late model G0 core, you should be able to reach 3.0 GHz at stock voltages and a good cooler. 3.3 GHz shouldn't be hard. Anything more will depend on practically everything in your system except the video card and hard drive.
Mine runs at 3.6 GHz. (Prime95 stable for 72 hours; core temps 61 - 65 C). Hey, I went away for a weekend and just let it run.
HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1 http://www.tomshardware.com/forum/240001-29-howto-overclock-quads-duals-guide
Core 2 Quad and Duo Temperature Guide http://www.tomshardware.com/forum/221745-29-core-quad-temperature-guide
You also should have something about your specific motherboard.
----------Overclocking since 1978 - Z80 (TRS-80) from 1.77 MHz to 2.01 MHz