These are some answers from other forums

Quote Originally Posted by Mithent View Post
Core 2 LGA775 server chips have not been better or worse than desktop chips, I believe, except that they have different microcode and this risks incompatibility with some motherboards.
Quote Originally Posted by silent-circuit View Post
After pretty much going through hell as a result of decided to get (on more or less a whim) an X3220 instead of a Q6600 (both 2.4Ghz 1066Mhz FSB rated quads with 9x multis, same cache sizes, etc...) just trying to find a board that'll play nice with the thing I now /fully/ support what most of the [H] staff already repeat on a regular basis:

Desktop CPUs for Desktop boards.
Server CPUs for Server boards.
Do not mix them.

It may work perfectly... it may be torture. They are not the same, as the Xeon identifies itself to the machine differently (uses different microcode). Given Xeons are pretty much never officially supported on desktop boards, I cannot recommend you play the game I have been for a few weeks now.
after stuff like that, i wonder ... is the Xeon 3110 worth going with? that is my concern .. some say its really good ... others say you shouldn't get it ... I want some answers from people that know for sure what they're doing.