I have two problems:
1) When I try to use autofan in cgminer with my 5970 and 6870 in the same computer, only the 6870 is controlled. I haven't tried it seperately, but I feel this is a problem because the two gpu's rely on one fan.
2) I have tried running my 5970 on a clean install of windows XP, with only the SDK driver installed and cgminer running, and I get some pretty erratic results. One gpu runs fine at 320 mhash, but the other one runs at ~150 and racks up about 1,000,000 HW: errors/min.
Miraculously the 5970 runs perfectly stable at 850 oc & 1.03v in windows 7.
This is my face: