Server board for gaming system

Hello, i am building a new system for myself and a friend. my friend has it set in his mind that he wants a dual cpu soultion, i myself was toying with the idea of building a Xeon box for my new comp. skull trail was sort of a flop and i want to go with i7 tech anyway. i was looking at boards and i know in the past server boards have alwas had a bottle neck when it came to memory as it has been much slower thain single cpu 'gaming' systems. i found that many new board run ddr3 at 1333 and have multipul pcie lines, this has changed alot from the last time i looked into this many years ago. I was looking at the following board: http://www.supermicro.com/products/motherboard/QPI/5500...
if i used this board i would be looking to run a quad sli or crossfire system with dual Xeon's and around 24GB of ram, perhaps more.
i myself do a lot of 3d molding and photo work while my friend just wants a system for bragging rights. price isn't really a large issue so long as we keep each system below 5 or 6K.
my question to you all is, have any of you built a server to run as a gaming system? and what issues might you expect to run into doing so?