One of the great advantages that PCs have over their Macintosh counterparts is that they are inherently customizable. If a new part is developed that would enhance your existing machine, all you have to do is replace the part you currently have in your computer with the other one, and presto, you've upgraded your machine. Video cards--the hardware that enables your computer to run all those snazzy 3D games--are no different. It is not difficult to remove a video card in order to replace it, though care must be taken to avoid damaging either the card or your motherboard--which is where the video card is plugged into.
Make sure your computer is turned off and that the power cord is disconnected. This is to prevent power shocks when removing the card.
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Open your computer case. This is done differently for each case; often, there will be small clasps that need to be popped, and the case will slide off toward the back. The case may also be screwed down as well, so be sure you have a small screwdriver handy.
Locate your Nvidia video card inside the box. It will likely be the longest and largest card attached to the motherboard and may contain its own cooling unit. If you are unsure of what your video card looks like, please consult your user's manual.
Detach the Nvidia video card from the computer case. Do not pull the card out of the motherboard socket just yet; likely the card is attached to the case by a clip or screw and a metal bracket. Search the rear of the case for such attachments and remove them before doing anything else.
Pull the card directly away from the motherboard once the card has been detached from the case. Do not jerk the card or suddenly yank it away. Grip it firmly and apply steady pressure, working it side to side gently to dislodge it from the socket.