If you want to game at 2560x1440 get a GTX 680 or GTX 770. I doubt the RX 460 would run games adequate at this resolution: http://gpu.userbenchmark.com/Compare/Nvidia-GTX-680-vs-AMD-RX-460/3148vs3641
The GTX 770 has native OS X support like the GTX 680, same chip. Much cheaper on eBay than the GTX 680.
You can send in the GTX 770 for flashing: http://www.macvidcards.com/store/p81/Nvidia_Flashing_Services.html
Once flashed it supports 2 x 6 pin cables, even if the card has 6 + 8 pin connector.
Quote: When there is a 6 pin and an 8 pin, things get more complicated. On many GTX680 cards the 8 pin is "optional". This means you can plug in a 6 pin and the card works fine. For many GTX770 and GTX780 cards we do a mod to the card that creates this same functionality. So you can just plug in the 2 @ 6 pin cables and it should boot right up.
http://www.macvidcards.com/blog/my-efi-card-starts-booting-but-stops-during-boot-and-then-crashes-and-reboots
Thanks for your answer.
It's not for gaming. It is for my MP 5,1 in my recording studio. No heavy lifting GPU needed.
My original 5770 is having problems to drive Pro Tools, leaving the CPU to do additional work, and therefore eventually overloading the DAW at lower buffer settings (that I need...). I just need something a little more powerful, that is available at my local vendor, and works well OOTB.
I don't live in the US so sending the card to MVC is impractical and expensive because of customs duties.
It is apparent that the RX 460 has built in drivers on Sierra 12.1. My questions regard the best brand (Gigabyte vs Sapphire), and if flashing is needed...