I am looking to setup a crossfire setup with 2 HD 5870's. I know I can run any HD 5870 gpu together but Do the hd 5870 have to have the same amount of ram? There are 2 options of this card 1 with 1 gig of ram and 1 with 2 gigs of ram. Can I run a 1 gig card with a 2 gig card to give a total of 3 gigs ram? I would think it would work as long as its the same GPU but I am not sure.