My stock 5770 in my Mid-2010 MP is now showing it's age by Unreal Engine games now requiring Metal. Seeking advice as to what would be a good replacement. I'm not a huge Mac gamer so nothing too expensive. I understand that lot of the older nVidia's should work. Was leaning towards a used 760. Would really like to be able to flash it with the Mac Rom in order to see what it's doing during boot up. Been searching around the interwebs and haven't found what would be needed for this model. If there is a better / easier choice that still doesn't break the bank, that would be great. Thanks!