Will a double-wide PCIe video card work with my iMac?

I have a 24-inch Aluminum iMac and plan on doing some serious gaming with it on Windows XP.
1. If I were to buy a graphics card, such as the soon-to-come 9800 GTX, would it fit?
2. What currently available NVIDIA GeForce 8800 and 9800 cards are Mac compatible?
3. Would it void my warranty if I switched it out myself?
4. Could I get a Genius at the Apple Store to put it in for me?
UPDATED by dotBran
Message was edited by: dotBran

There are no solutions that are going to give you better graphics performance than the graphics processor built into your iMac. Any external solution for driving a display would have to connect via USB or Firewire, either of which would be significantly slower than the onboard video.
Sorry, but if you want better graphics performance, you'll have to buy a different computer.
Note, though, that adding RAM to your system (your profile says that you only have 1GB) will offer improvements in overall performance and is highly recommended if you intend to run Windows, either via Boot Camp or a virtualization solution (most especially the latter).

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Solved!
Go to Solution.

I'm not sure- but it would appear that I'd have to buy a new power supply as well, since the factory one I think is only 265??? Which seems pretty low for a system with an Intel Dual Core, DVD burner, 500 gig HD & 4gigs of memory! Seems most PCI express gaming cards need atleast 300 watts-

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The video cards need at least 30A to make the card run properly. That's pretty damn easy to understand how the last PSU was the problem.
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{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
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