August 30th, 2014 10:16 PM
The 750 series is not yet supported by Mavericks. See the tonymacx86 Buyer's Guide, Graphics Cards, for recommended (supported) graphics cards.
You could also use the H87N's on-board graphics until the 750 series is supported by Apple. (I, too, am anxiously awaiting the 750 Ti's support.) :thumbup: