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Unlikely, Most iMacs have built in graphics cards and dont allow user upgrades. Would depend on the model. a GTX 950 is 3 revisions newer but 3 models down from the 680 (XYY) X = Revision, YY = Features but with each new revision, the features are improved so likely a 950 is similar to a 680, the only way to know for sure is check out a GPU Comparison site such as http://gpuboss.com/gpus/GeForce-GTX-950-vs-GeForce-GTX-680
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