I agree.

I have on a 2nd machine,

P5Q3 Deluxe/Wifi
Q9550 C0
2 x 2 GB Gskill 7-7-7-18 1.9V HZ mem.
Xigmatek S-1283

I am running that at (450 x 8.5) 3.825 at the moment.

Memory is running at 1800 MHz @ 8-8-8-21 2.04V

I have not tweaked the system yet, so I'm sure I can probably get more out of it.

with a Q9550 E0, you should be able to hit 4GHz+ easily with good air cooling.

P45 is the way to go if you really want to OC a quad.