Upgrading Imac ati radeon X1600?

[Rbanh]

Hi ive been reading here a lot, and this is my first thread.
I just recently finally installed windows 7 via bootcamp on my 20" Imac, so i could play steam games like Half life 2, or CoD: MW2. but at games like MW2 systemrequirementslab.com says that my video card is too weak for MW2, and i was wondering if there would be a possiblity to Upgrade the video card.

Specs:
Intel Core 2 Duo 2.16 Ghz
2.5 GB RAM
OS: Windows 7 64-bit
Display: ATI Radeon X1600

(Info from dxdiag.)

 

[Eidorian]

You're going to need a new computer to get a better GPU.

 

[StruckANerve]

Sorry to be a downer but the card is not removable or upgradeable.

 

[Rbanh]

Gah, thats a real bummer i spent hours defraging the hard drive so i could finally partition.