6600GT getting very hot

My XFX 6600GT is getting extremely hot. I recently applied new thermal paste, but the temperatures remained high. The fan is set to 100%, but when I put my hand under it, no air seems to be coming out. The fan is running, though. As I type this, it's about 55F in my room right now, and my case is open. The processor is idling at 39C, but the video card 60C. I've put an 80mm fan next to the video card cooler, but the temperatures again stayed the same. Also, I'm wondering if the heat could be the cause for the odd artifacts I get in Portal/Episode 2. They start off as green/purple/red triangles, which color the textures oddly. It eventually covers the whole screen. I do have it OC'd, but setting it to stock or even underclocking it only yields a difference of a couple of degrees. Thanks in advance.

Edit: Load temps some times even exceed 90C. I've even seen it at 100C, but the PC shuts down if it goes any higher.