Due to space considerations many mATX motherboards lack two PCIEx16 slots. Thus, you are not going to easily find a micro ATX which supports SLi. The one that you mentioned, as spathotan said above, supports Crossfire. If you are to go that route you will obviously need ATi graphics cards. I happened to find a DFI board that satisfies your SLi and mATX conditions. That being said, the hardware support on it is not miserable by today's standards. The support that you are going to get from this comes in the form of Hybrid SLi where you pair a PCIEx16 with a PCIEx2. At the bottom there is a URL attached with nVidia's list of Hybrid SLi chipsets. Assuming that you are looking to go with a Socket 775 CPU, you will be restricted to nVidia chipsets on ATX boards. If funds and space permit, the ATX (with an nForce 600 or nForce 700 series) is the way to go for SLi. But, if you want to be on the cutting edge and just need that Intel chipset, the X58 for the Socket 1366 will do the trick. Best of luck and hope that helps.