well i always used the auto OC and did it by 20%, my 2.8northwood was then on 3.4, usually around 3360 mhz, but after some hardcore OCing, i manged to get it to....3423mhz...yay, i know its not a 'huge' incresee, but its the best i could get, i set the volt at 1.5 the fsb at 163, and i couldnt further it at all, i even put the ram down to 266, but i just count break, that 164 fsb i then wacked the ram up to 333, so its now going at 200mhz
http://i2.photobucket.com/albums/y45/rilt/cpuz.jpg
http://i2.photobucket.com/albums/y45/rilt/cpuz.jpg