Those 5970 really blow the hot air out the 'front' of the card, so will you be mounting these new rigs in a reverse direction then all the others? so the house fans blow the air from back to front?
All of the hot air on my 5970s blow out the metal end of the card where you plug in the monitor. If you look at the bottom of the rack in the picture above, you can see they are sitting reverse from the rest of the machines. All of the other cards rely on pressure in a normal computer case to help blow the hot air in the right direction so when they are in the open, they don't do what they are supposed to.