Originally Posted by Orange
Sorry but a vdroop mod?, no idea what that is what so ever
A vdroop mod would be a very good idea for your motherboard, since the Asus P4P800 Line is nortorious for major vcore drooping, expecially with prescotts! A vdroop adjusts the stability of the motherboard vcore so it will stabalize it and only allow for a little droop. It is a fairly documented mod, but if you have zero experence soldering, send it to Lando or someone who knows what they are doing. In a nutshell, it will allow for a better OC. I had my Abit IC7-Max3 vcore drooped when I pushed my 2.4 to 4GHz.
Or you could invest in a canterwood chipset (875P) and not have to do the vcore droop. The prescotts are hard on the Springdale (865) chipset, and will start to limit your OC eventually.
As for your CPU, yes, it can go farther, definitly. You have the E0 stepping, and depending on your temps, 4.2+ would be possible.
I have seen some Pressy's running 1.55v of vcore stable on Air. You could probably get up to 1.8v on phase and 1.6v on water.