I have a 2008, 3.2Ghz Quad-Core Mac Pro, that's currently running two 30" Cinema displays off of a nVidia GeForce 8800 GT video card. I need to add a third 30" display. Would someone recommend the second video card I'd need to buy? (The bus on this vintage of Mac Pro is limited to 300w of output, and only the first two slots are PCI x16, 2.0) The 8800 GT is also uses one of the two power outputs on the "Logic Board" via a cable. In terms of Display Preferences, I need to run one as an extension--two side-by-side--and mirror the other one, which will sit across the studio, connected by a 15' Gefen Dual-Link DVI cable. Currently, I have everything set up and working beautifully, with the exception of the third display working as an extension to one of the mirrored displays. Is the safe bet to buy another 8800 GT? And has anyone successfully configured three displays in this way (two mirrored, one extended); even though, the info on the Apple help pages says it can be done...? Thanks very much for any help or info you may be able to provide!