How to Replace Video Cards on a Mac (7 Steps)

Power off the Mac Pro computer and unplug the power cord.
Remove the side cover by lifting the lever on the back of the case.
Pull out the existing video card.
Insert the new video card in the same location.
Connect any auxiliary power connectors to the video card. In most cases, this is an adapter that converts from the standard molex connector type to PCI-E.
Replace the side cover and power on the computer.
Optionally install the latest drivers for the video card. Visit the video card manufacturer's website to obtain the latest driver software. The video card works without the update, however.
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