xXz21Xx

I one of few owners of p6t (normal). All i did is updated the bios on p6t to the latest one from asus website. You need a i7 cpu such as 920 (it usually costs $5-10)
after that just replace 920 with you xeon and you good to go.
you also need to cool the vrm’s and north bridge with a fan or 2.
Ram is fine, but it is good to get another set of the same ram (it is probably around $30) so you can get tripple chanel
 

I don't see many reasons for it to not work.
 
Even if it doesn't, it's not like you're in the hole by too much anyway. Might be a good idea to double check stuff regarding BIOS updates and whatnot.