I installed my 2.53 P4 CPU and the Swiftech MCX4000 heatsink/fan to my 8IEXP. Man, talk about a "tight" fit! I used a flashlight to see if the heatsink was in direct contact with my CPU. From what I saw, it is. I used a razorblade to apply the thermal paste to cover the entire bottom of the heatsink (not too much needed).
I did have to adjust the "caps" a little to keep them from touching the edge of the heatsink. I was shaking like crazy! I could see myself breaking one off and just crying! Now, all that's left is my case, memory, CDRW, hard drive, floppy and keyboard (should be here by the end of the week).
I will post here once I get it all set up.