So yesterday I installed the Arctic Cooling Twin Turbo 2 on my GTX 680 4gb FTW, because I've read countless threads of people getting super low temperatures with it, but for me it's only made things worse. My computer is a mac pro 4,1, and these temperatures are under bootcamp. Stock temps: 40 idle, 70 - 75 load. 1st try: 45 idle (even with 85% fan), easily went up to 80+ without doing much. This was with Enzotech forged copper heat sinks, using the 3m sticky heat pads, and the thermal paste that was pre applied on the twin turbo. I assumed I had a just installed it poorly so I tried again. This time with Arctic Silver 5 and thermal paste instead of the sticky pads on some of the heat sinks. I set the fan in precision x to always be at 85%, because even then I pretty much can't hear it. Idle was 35, but Skyrim went right up to 90C. I quickly shut everything down, reread directions, tried again with AS5, the result with constant 85% fan was around 35 idle, 80 load. I don't know what to try next, I know the temps are playable, but it seems strange that I would be the only case in which this cooler is worse than the stock cooler. Plus, easily hitting 80 with max fan speed is a little uncomfortable. Could this be due to the general airflow of the mac pro? If anybody has any ideas or suggestions I would be very grateful. tl;dr: Twin turbo on a 680 in a Mac Pro makes things hotter, even after several install attempts, looking for possible reasons/solutions.