MacOS – Which graphics cards or integrated GPUs support metal

This might not be exactly what your looking for but Bare Feats has several articles on the current state (or lack there of) video cards for the Mac Pro.

Take a look at CUDA compatible GPUs for the Mac Pro and Abandoning Apple 'Blessed' GPUs

I recently had to replace a second dying NVidia 8800 GT in my Mac Pro (early 2008) but decided to stick with an Apple card.

Most of the non-Apple branded cards will not work until the machine is past the boot volume selection screen (if you need it) and I seem to find myself switching boot volumes frequently.

1.) This is a known Apple issue. It's insane that it existed in the first place, and it's worse that it still exists, and effects every dual-GPU Mac I have seen (in the office, at home, friends' laptops, etc). So yes, LOTS of people have this problem.

2.) Use gfxCardStatus to keep it locked in discrete mode, keep restarting Safari, or switch to Chrome. The Webkit nightly build isn't fixed, so I'm not sure when a 'real' solution will come about.

3.) That's very unlikely. As I said in (1), this problem effects all sorts of Macs, most of which do not have CUDA installed at all. It also looks like a problem with the Intel GPUs, not the nVidia ones.

Sorry for the bad news!