Graphics on 17 inch desktop iMac?

Hi,
My iMac can't run Portal 2. I know it's the graphics card (error messages) and i was wondering if I can replace it or trick the game into thinking I had.
I found this post but it didn't mention 17-inch Macs
It is a 17 inch intel Mac BUT it is one of the thick, white ones.
Any ideas?
(P.S It's an ATY RadeonX1600)

iMacs asa group allow minimal changes. RAM is easy. HD is hard but doable. GPU is soldered to logic board, not upgradable.
And even if you could trick the application, the game will be over when the game asks for a graphics command your card does not know about.

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