Okay so I am new to computer builds and whatnot, so dont go crazy on me. I have two computers. A desktop that i plan on making a good gaming rig, and a laptop that is for travel and light gaming use. My desktop is a Dell Dimension 2521. What I would like to know is if it is possible to switch several things. One being the case, which I would change to a CoolerMaster Haf 922. And a video card. (MSI R4890 Cyclone OC Radeon HD 4890 1GB). I may also possibly put in more ram and fans, as well as a fan control. But for the most part, the case and video card are what is most important to change. What I would like to know is if it is possible. Thank you.