Although I have made no effort in installing Windows XP/Vista in my machines to get temperature/performance testing, the temperatures in the expansion slots bay did not reach as high as 60°C. The 8800GT (w/V2 cooler/fan installed) in the 2008 Mac Pro averaged around 45°C in a no A/C room on hot day here in SoCal. Machine runs all day, I only put it to sleep when I go out of town.

I was thinking of getting the HR-03, but the (two even w/o fan) blocked slots turned me away. (the V2 w/fan blocks a slot also - see pix below)
My setup is quiet and cool. The V2 heatsink sometimes gets tolerable hot to touch, sometimes only when playing iTunes visualizer. (3D gaming would also stress the card/increase heat.) Thank you for a very informative website.
-Ritche
here are the pictures:

V2 on 8800GT

V2 on ATI X1900 (from 2006 Mac Pro)

If you've done a Mac graphics card cooler swap/mod, install guide, etc. let me know the details. Thanks.

Other Graphics Card/Cooler Related Articles: - See the Video topics page, Graphics card and Coolers section.