I believe it would fit on the GT. The thing is, the KO cooler isn't anything special. It's just a stock cooler with a copper insert and an expanded fan shroud. The copper insert is actually pretty nice, but overall the cooler isn't much better than a spec NVIDIA cooler, and I kind of think the fan shroud might even inhibit the airflow. If you want to get a GT with a copper cooler, get the eVGA 7800GT CO. Better yet, get an NV5 Silencer from Arctic cooling, it cools much better than the KO cooler. I will go ahead an qualify that recommendation, since I just installed NV5's on my KO's last night. The NV5 performs much better than the KO cooler, but it has some issues that make it more difficult to install that it needs to be. At this point, my opinion on this is that the KO cooler you are looking at doesn't perform well enough to justify its cost, and the NV Silencer works great, but you need to be aware of the install issues before you buy one.
Here is a great thread that details pretty much all of the issues that people have had installing their Rev. 3 NV5 Silencers.
http://forums.anandtech.com/messageview...adid=1708251&STARTPAGE=1&enterthread=y