I currently have an XFX 6970 and am going to buy another 6970 in order to CF. Should I go with another XFX, or is there a better brand that helps offset the heat issue when 2 cards are placed close together? I have an ASRock Extreme 3 Gen 3 MB, and I believe there will be a cards width thickness of space between the 2 installed cards for ventilation. Also, I have a Haf 922 with the 200mm side fan installed.