http://forums.us.dell.com/supportfor...en&cs=19&s=dhs
So this really is a laptop with upgradable graphics - in which case, you are sorely limited by the options available, as this is not a current system.
It appears that the Quadro4 700 Go is the "workstation" version of the GF4 4200 go, the mobile version of a Geforce4 Ti4200 ... a DirectX8.1 generation card that on a desktop, power users would now be upgrading from, not to -switch to a desktop for gaming, unless you have no alternative, as that card could well be beat by todays "budget" desktop cards, and certainly by the next level up from the bottom.