Ok I've managed to get it up and running in OS X using the automated script people keep talking about on GitHub. I'm not sure if there's a better way to get things working? as nothing's been mentioned.
So far the setup is holding strong through a few benchmarks I've done in both Mac and PC Bootcamp, and I haven't had a crash yet. Also starts up every time, don't have to do any weird timing things with my card as some do, just plug it in and switch on the computer.
I've attached the results of some tests I've been doing and it seems to perform similar to when the card is in my Mac Pro desktop, maybe 10-15% performance difference depending on the task. Also I measured the power load taken by the PSU using a wall outlet meter and it measured 211W max during the Heaven benchmark, all other tests were below that amount.
