So sorry to bother you about this but was wondering about this card ATI Radeon X850XT From what I read it seems as if the card takes a AGP slot, but I thought the same name card can apply to different type slots. THe computer I'm looking at is a used dell 9100, 2.8 GHz Intel4 processor; Bus speed 800MHz, RAM 1 GB ( 4GB max),above card - and here is what I think you are saying is most important: as said.. "Expansion slots: 4 Memory, 3 PCI, 1 PCI Express x1, 1 PCI Express x 16,1" - though I am not sure what the "x16, 1" means. I'm a biologist, what can I say! : ) My 15 year old daughter is wanting to do a project this summer while out of school; she loves Theif, and has been fooling around with Dromed, but just begining. I was thinking with the development of the DarkMod, it may be good for her to start trying to learn that, with the tutoring available online. Got the Doom3 game, so just need to get an extra computer. Dont want to put some money out for one, where it cant work the game. Thanks again