Replacement Graphics Card

Mmy Nvidia geforce 8800GT has malfunctioned,and now needs replacement. However I am finding it difficult to find an equivalent replacement

that is not prohibitively expensive, or second hand.

I Have found a new Nvidia GeForce 120GT which is only £80.00, so I was wondering does anyone have experience of this card in a 2008 macpro.

Would I notice a difference using this card in terms of performance against the 8800GT. the macpro is mainly used for Photoshop,raw conversions

and watching video.

any additional thoughts or ideas will be gratefully received.

thanks