Can't update nVidia 8800 GS on iMac...

Boot camp has an older driver, like 163.xxx something..
Downloaded the newest 173.16 WHQL driver from nVidia, but when I run it, it says it can't find a valid video card. I know my iMac 3.06 gig machine has the nVidia 8800GS card, so what gives? Did Apple change something in the card's .inf file?
If I try to force the install, it tells me that Windows cannot verify the card and it could fail, etc...
What gives? Why does Bootcamp insist on using such an old driver?
And why does Windows not let me update my 8800GS?

On the contrary, I believe it is the same video card that is in the Mac Pro. This quote was taken from the UK MacWorld review of the system. The link is: http://www.macworld.co.uk/mac/reviews/index.cfm?reviewid=2599
It actually transpires that the 8800 GS in the iMac isn't actually an 8800 GS at all, but the same 8800 GT card from the Mac Pro that has been clocked down to match the 8800 GS speed. This is great news because it means the Memory Interface is 256-bit, rather than 192-bit; plus you get the extra memory itself. On the whole it should sit somewhere between the 8800 GT and a regular 8800 GS. We assume that the card had to be restricted because it would overheat in the small form-factor of the iMac. The 8800 card itself is fairly large (hence it's absence from the 20-inch iMac models) and runs at considerable temperature.
It may even be possible to overclock the card in the iMac to match the full speed of the Mac Pro card, although we wouldn't recommend it because the excessive heat would almost certainly cause your iMac to crash.

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