Hi guys, My friend told me I should have two graphics cards to play Battlefield 3 so I bought two 15" Macbook Pro's, they have the 6750M in them. My first question is how do I connect these guys together? I tried all the network stuff but can't get the graphics cards to connect, can't seem to figure out how to link the graphics cards. Could both Macbooks be faulty? Should i return them? Im kinda new to gaming so please help!