adimeister :
I also have an ATX setup, I know there are none. That's the thing you have to sacrifice with ATX builds.
If you don't know you should at least google it before answering. Of course the OP could have just done that too. Micro ATX has 4 slots. SLI micro ATX boards.have been out for literally years. Obviously you'd want gpus with blowers though.
www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007627%20600093976%20600009017%20600176035&IsNodeId=1&name=2