Hi, I recently got a Radeon 3870 direct from ATI for my mac pro. The fan is always spinning and is quite loud, even when idle. It is significantly louder than the stock 2600 XT, which was absolutely silent when idling. I've read some threads where people say they hear their 3870's fan speeding up and slowing down in OS X, but mine is always audible, and I never hear any speedups or slowdowns. In Windows XP (Boot Camp), GPU-Z from techpowerup.com is reporting a fan speed of 43% when idling, with a temp of ~45C. When I play a game (GRiD or DiRT), it reports a fan speed of ~70%, with a temp of ~75C. The fan speed never slows down below 43%. Has anyone else noticed this happening? I have installed the Mac ATI drivers that came with the card, and am running Catalyst 8.7 on the Windows side.