gaep45ds3

OK im about to buy the motherboard model GA-EP45-DS3 Now it says it supports crossfireX for the ati cards but I got a problem I don't understand: It has only 1 PCI-E 16x and 1 more PCI-E 8x and they both support PCI-E 2.0 Now what I don't understand is that cards like Radeon HD 4870 need...