Yes you can but it won't work. Why you wanna do that anyways?
I have the P4 HT, which is my muck around PC and recently got a cheap but good Graphics Card for it.
Plan is to down the track buy it a new mobo, CPU and memory for it. (hoping for around $300.)
I use it for light game and general use at home. The reason for putting the E8200 in it is that I have the processer spare which is going to waste.
Could I go the other way.
The two machines are.
1x Acer Veriton 7800, P4.
1x IBM ThinkCentre. Could I put the motherboard from the IBM into the Veriton? Then I can still add the graphic's card but will get the better CPU.