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The D820 (I'm assuming you mean the Dell Latitude) can come with Intel integrated (GMA950), or with an nVidia Quadro NVS 110M Turbocache, either a 256MB or 512MB model. If you buy the GMA950 model, I doubt you can upgrade. If you buy the 256MB nVidia, I'd say it's a reasonable guess that you could upgrade to the 512MB model later, if you can find one at a reasonable price. There aren't any upgrades that I know of to high-end gaming cards or anything though; you'd probably have to look into the XPS line of laptops for that.
Having just done battle with Dell over their "claimed" graphics memory, I can assure you the video is imbedded in the system board is not upgradeable without changing the board...per Dell. Another thing to watch for, the 110 is rated at 256mb/ram, the 120 at 512. Actual on-board ram on the 110 is 128mb and 128 shared with system memory, same for the 120, 256 on-board, 256 shared....this is not plainly stated on their web-site and sure as heck should be.