Well, no. You see, If you have a D800 with say, the Mobility Radeon 9000 (- which they did have for a brief period), and then Dell release(d) the new GeForce 4 Ti 4200, you could "upgrade it". Just because the I8600 has a new graphics card, doesn't mean that you on your old I8500 can now upgrade to it, but if they release the GF FXgo5650 on the I8500, you could upgrade to it.
This is all beside the point, however, as you if the card fits your machine - regardless what model it is, there will always be a way to upgrade it. All you do, is flash your Dell's Bios with that of the Dell that the cards is designed for, and voila.
And you can't send it to Dell to upgrade your card, they won't do it -unless it is exceptional circumstances - you HAVE to perform the upgrade on your own.
RaPTuRe
P.S. They are the most upgradable so far: A Dell Inspiron 8100 (Pentium 3-m notebook), can be upgraded with a Quadro4Go 700 (Essentially a GeForce 4 Go 4200).
RaPTuRe
Who's General Failure and why's he reading my disk?