EVGA GeForce GTX 680 MAC 4GB 256-Bit GDDR5 PCI Express 2.0 Video Card Support Apple system and Win dual system... Apple system driver free GPUs / Video Graphics Cards - Newegg.com
Trouble with Geforce GTX 680 in Mac Pro 2010 5.1 : r/macpro
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nVIDIA GeForce GTX 680 2 GB PCI-E for Apple Mac Pro 3.1 - 5.1 #323870