I recently found a good am3+ motherboard(http://www.newegg.com/Product/Product.aspx?Item=N82E16813131851), but it says that it supports up to quad sli. Is this just because it has the 4 pci e x16 slots. Because I saw the product image and it looks like it could just support dual sli with some restrictions due to space Is this bad design or what? Are there even gpu's that slim to do quad sli or crossfire? Also what else can you use the slots for if not gpus?