So I emailed asus about the Prescott issue..

This is the answer I got.. Sir at this time due to no cpu's available to test with ASUS cannot say if this board will support it or not until the cpu's can be tested ie:they are made available we cannot give a deffinitive answer.If you have any further questions please contact us back at 502-995-0883 and give the tech who picks up this case # and I asked him If the P4P800 Deluxe Supported the Socket 478 Prescotts.. O well Im just getting the MB with a 2.4c anyway