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    Mac Pro (2008) Graphics Card Upgrade Advice

    Right now I'm running my 2x 2.8GHz Quad Mac Pro 3,1 with the ATI Radeon HD 2600 XT 256MB. Currently on OSX 10.9.5 with no issues. However, I can see myself upgrading to El Capitan or whatever comes after that eventually, and probably start to use some more image processing software (Pixelmator...