I have a Dell 8200 from a couple years ago, it has 512mb of RDRAM. I want to upgrade to 1gb. Does anyone have any advice? Brands, specs, etc? Also, would it be easy to upgrade the graphics card? If so which is really good? (I play alot of games and have noticed alot of slow down recently) Right now I have the GeForce Ti 4600 so I want something that would be a vast improvement over that. Thanks for all the help.