Graphics Card upgrade iMac 24" 2009 model help required!

[Rlnplehshalo]

I have an iMac 24" 2009 aluminium model (2.66ghz, 4gb ram, etc)
It also has the NVIDIA 9400m 256mb graphics card, now I keep hearing from various sources that it is possible to upgrade this card to a more powerful card.

First off, is it possible to do that?

Secondly, I would be considiring a radeon HD 500mb-1Gb (if possible) to be able to play "Call of duty modern warfare 2" and "Battlefiled bad company 2" etc. with a breeze at mid - high settings.

Thirdly, I live in Australia (Melbourne to be exact) and was wondering if anyone knew any websites or stores that I could buy the card from and let them install it?

Thanks in advance,
rlnplehshalo

 

[TMRaven]

The 9400m is not a dedicated graphics card, it's a gpu that's soldered on to your computer's motherboard, and uses the system's ram for its own graphical needs.

 

[Rlnplehshalo]

If it uses sytem RAM then is there some way to increase the RAM allowance or is that up to the cards maximum ability?

 

[TMRaven]

If I remember right, there is a way if you use windows. Not under osx though.

 

[Rlnplehshalo]

I'm running windows 7 under bootcamp so if its not a bother, may I ask how?

 

[Rlnplehshalo]

Here state's that the 9400m boost's its memory to 512mb when running in windows bootcamp, might just be my lucky day