The D8200 has been a rock solid system. You will be getting the 850 chipset with 400MHz FSB so the maximum CPU upgrade will be to 2.8GHz. Basic ram was 256MB (2 x 128MB) RDram. Like the other poster said it is outrageously expensive - but seeing how you don't mind used off ebay this shouldn't be a problem. It has to be installed in pairs. your other to ram slots are filled with Continuity modules just to complete the memory circuit. You will get four PCI slots with three filled: Santa Cruz sound card, 56K modem and NIC. The video card, GeForce4 MX 420, is a piece of junk. I have been quite happy with my system but Q3 2006 will be time for a new (build) system.
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Dimension 8200 (July 2002)
3.06Ghz P4 w/HT 533fsb---------------------------------------768mb pc800 rdram
128mb BFG GeForce 6800oc (16 pipes enabled)--------Dell 250W PSU
Sound Blaster Audigy2 ZS -------------------------------------Logitech Z-5300E 5.1 THX
P992 19" Flat Screen Monitor----------------------------------Floppy Drive
40X CD-RW--------------------------------------------------------80GB Ultra ATA HD
Intel 10/100M PCI Network Card--------------------------------USB 2.0 Hub
If I could just chime in, for what it's worth...I have had a Dimension 8200 since January 2002. Other than upgrading from 512MB to 1GB of RAM (yes, it cost me about $200, expensive RAM on this model), and adding a Firewire/USB 2.0 Card (since this Dimension only has USB 1.1) -- this has indeed been a ROCK SOLID system. It runs as smooth today as the day I took it out of the box and set it up.
I'd say you found a gem if you got one of these on eBay. Sure, it's not a gaming machine, but it's a high-end (or was in '02 and '03) machine great for the home user who wants to do digital photos and do everything but games.