Hi all,
I was wondering what is the best graphics card I can put in my Mac Pro 2010 5,1?
Using the existing PSU?
It is a genuine 5,1 and has the stock HD 5770 in it at the moment.
Thanks
I think it depends what your usage and experience with swapping these things out is, and what your budget is.
If you're a basic user who wants a simple hassle-free upgrade, and you'd like to use OS X as you're used to, I'd try and source a Mac Edition EVGA 680. Alternatively, you could buy a 680 second hand and flash it; there are plenty of solid guides on this site for doing that.
If you're a little more advanced, and you can live without boot screens (seeing the Apple logo), then currently a 980 is the best performance you can get for the Mac Pro. Nvidia have just announced the 1080 and the 1070 which could both also work when released, but currently there aren't any OS X drivers for them, meaning you'd be limited to using it in Windows.
If you're more than comfortable with OS X and 3rd party hardware, the Nvidia OS X Web Drivers support up to the Titan X and the 980Ti, but these cards draws 250w, 25w beyond the power your Mac Pro can safely deliver. To power cards in this range, you're best off obtaining an additional power supply to power these directly, or if you're very brave, some people have successfully modded their PSU to provide more power (though this seems quite excessive to me personally).
Unfortunately, AMD haven't been so kind with OS X support despite their prevalence within Mac hardware these days. They offer no OS X drivers past what is provided with OS X (which I believe is written by Apple anyway). As such the latest AMD card officially supported is the 7950/7970, although there are reports that higher cards work because they share the same Tonga chipset. Fiji cards (Fury Nano, Fury X) aren't currently shipped with any available Mac, so there is no driver support within OS X.