quadro fx 6800 is way too old
nVidia by far. But it depends. If your looking for game play then get your self a nVidia card.
amd radeon is the best compare to nvidia
The NVidia is faster.
Nvidia make some of the best graphics cards around. The Nvidia 550 ti is a very good card from their range.
I'd say nvidia but I'm a fan of nvidia so...No! This Nvidia graphics car is far too weak ,Ati Radeon is better (it has 80 stream processors) ,but this Nvidia ...Hmmm I dont know (it even hasn`t Cuda processors) My personal opinion :)
A good graphics card for low details on games is the nvidia 8800. I reccammend you don't get this just to be safe. To get normal to high graphics get the nvidia 9400. For high to best Graphics, get the nvidia 9800. For best Graphics, get the 260, 280, 285, 275, 290, (all nvidia).
Call of Duty: Modern Warfare 2 will not run on a nVidia GeForce 6200 GT graphics card. You will need a 256 MB nVidia GeForce 6600GT or better graphics card.
it will never be GeForce 8400 is improved and and is better than GeForce 6800 in every way
no
8500gt by far
Well, i wouldn't say upgrading your graphics, because the only way to do that is to upgrade to a better video card. You can get better video cards at a website called tigerdirect.com which has the best deals anywhere, it also has loads of info. If you want the most up to date video cards, i would reccamend getting the nvidia 9800, nvidia 260, nvidia 280, or the nvidia 295. And remember the better the graphics card, the better the monitor, CPU and the power supply needs to be.
They are almost equivalent, however the 2.6ghz with Nvidia 9400 graphics card is a great buy if they are priced the same.