No, we understood it.
The RS480 mobo's onboard graphics can't be disabled and take up a minimum of 64 MB of system RAM irrespective of the presence of another graphics card.
Yes, they can be disabled. Look in your BIOS.
Obviously I can't remove the display drivers (Catalyst) for the onboard graphics.
Sure you can. Even if you couldn't disable it, you could mark it as disabled in Windows, and uninstall the Catalysts - although Windows will likely still detect it and install its own built-in drivers if you haven't disabled it. But you CAN disable it, so...
My question is, will a 6600GT (and the Forceware drivers that go with it), cause a conflict with the existing display drivers? Because now there will be 2 sets of display drivers.
It might, but you CAN uninstall Catalyst. I don't understand why you think you can't. ???
I am asking this because I want to buy a 6600GT and am not sure if it will work in a ATI chipset mobo. If anyone is running a nvidia card in this mobo, please let me know. Otherwise i'll just buy a Radeon instead.
I've used GeForces on ATI chipset boards before. Of course, I've also disabled the onboard graphics on those boards.