I have a PowerMac G5 with Radeon 9600 video card that need to be replaced badly since it's really slow. I recently saw the specs for Nvidia 6800 GS (http://www.hothardware.com/viewarticle.aspx?articleid=747&cid=2) , and OS X compatiblity is mentioned. I want to replace my aging graphics card, and Nvidia 6800 GS does not seem like a bad option. Thanks in advance.