yes frick that is exacticerly the problamo, the fan on mine has a cone shaped center, and....luckily i was doin this to the ati silencer i bought and not the origional (they are basically the same thing but with different stickers), i started grinding the cone down......
sadly the point where it actually connected to the motor was still too far out, and i wound up breaking the fan... but i cut out the old fan and got a standard 80 mm fan and cut just the motor and fan blades out, siliconed it in place, werked fine till i actually got the master crossfire card.
This was all done as ahead of time before i got it so i wouldnt be so excited and get extremly frustrated.
But when i put it all together i get very little airflow, because they are so close together, it doesnt get hotter than the master, but it is up to around 70 degrees C, which it used to be 58-60 C,
Im a little upset, im about to make another backplate for it, one that hugs right up close to the card, and drill holes in the heatsink and put screws or nuts/bolts, so that i can swap coolers withe the master card, the master has a fan inset way into the heatsink, and draws air from the end of the card by the power connector.
I'll make it work it'll be a bitch but i will. Still id rather spend 20 bucks to make things easy on myself so please any1 give me ur video card cooler website pls.
ima have fun non the less