I was looking at getting another graphics card to crossfire. I currently have a Sapphire HD Radeon 5570 1Gb DDR3. I got this one originally because I was unsure of the space in the case I had on the way(Azza Fantom 900). After building it, I saw I have plenty of clearance to the side intake fan. When looking on the egg for another card, i noticed that Sapphire has brought out a 2gb version(larger in size as well). question I have is this, can I xfire these two cards or do i have to get the same card?