OK. So I have been sifting through the amazingly vast amounts of information regarding video cards on this forum and the community of mac pro enthusiasts here is incredible. I recently purchased a used Mac Pro 5,1 (2.8 Quad) to replace my upgraded 1,1 (2.66 Octo) ...I will eventually do the 3.33 Hex upgrade, just working through the budget right now though. Firstly though, I want to upgrade the video card from the stock 5770. From what I can gather, a 2x6pin GTX 580 is the very best card available for the machine in a realistic budget ($$$ and MP Power) right now... Is that true? Is the ATI 7970 a better card? Currently, I am considering the MSI GTX 680 4GB TF3 found here: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127695 What would you all recommend? My budget is around $500 and my needs will be primarily gaming across 3 23" monitors @ 1080p. Boot screen is not an issue to me. Thank you so much in advance for your help!