GeForce GT 120 for 2006 Mac Pro?

The X1900 XT card in my 2006 Mac Pro has died just a few months past the end of AppleCare.

The Genius at my local Apple Store checked the price of a replacement (£400) and said I would be better off looking at the second-hand market when I told him I didn't use it for games or high-end graphics.

The problem I have is that the machine is owned by my employers and they won't allow me to buy second-hand components. But they won't pay £400 to replace the card, either. I have a PC on my desk as well, and they will just expect me to exclusively use that from now on :0(.

However, I saw that the GT 120 is going for a 'mere' £123. I think I could persuade them to invest that much in keeping me happy.

I realise that this card will not be the most powerful I could have, but I don't do much more than standard office stuff on this machine anyway (I know, I know!).

Could anyone tell me whether this is likely to work with my system (despite what the system requirements state)? I can put up with less than blazing performance if it means less time in XP.

Thanks,

Phil