I just shoved a 285 into mine, borrowed from XL, and it worked, well! No drivers or anything.

And my frame rate went from an awful 66fps to 166fps!

I agreed with Apple Business that if 10.6.5 didn't fix my machine they can have it back. Not fit for purpose. I suggested that if they got me a 285 then I would keep it, even offered 50/50, but that wasn't an option. So they'd rather take a £4500 machine back than stump £150 for a graphics card.

Rubbish.