Bios Vmod for 6800
Thats the previous thread on volt modding, with pictures for the pencil mod.
If you really do something serious with the cooling, and that mod, expect over 500Mhz on water cooling, and in some cases over 600Mhz. It really makes an absolutely massive difference, but that is with a very high volt mod and water.
A minor volt mod, running with stock, or good air cooling, will get you a nice little bump. I would advise doing something with your cooling first though.
1: You could try removing the stock heatsink, removing the thermal paste, and using a quality layer of arctic silver 5 to improve thermal conductivity.
2: You could lap and polish your stock
HSF
3: You could try this coolermod (on the first page of this thread)
4: You could try a zalman cooler, as the NVsilencers are not the /best/ coolers anymore.