So I'm looking at switching out the ridiculously loud stock cooler on my Visiontek 4850 (oc'ed, so I do need to raise the fan speed to keep it below 80C during gaming), and I have heard a lot about the GFX Chilla, but its not very easy to find (in the States, at least). I am also interested in the Twin Turbo, as I had an Accelero S1 on my 8800GT and it performed wonderfully. First question, does the GFX allow for crossfire, and if so, is there respectable place to order it from in the US? And how does the Chilla and Twin Turbo compare temperature-wise? (Oh, and I am using a P5Q Pro, so I don't think there is a compatibility issue, but let me know if there is)