Make sure to line up the connector tab and the PCIe slot correctly and apply gentle pressure until the card "snaps" into place. Just like your old graphics card, your new graphics card has a connector tab along its edge that will fit in this slot. Before inserting your new graphics card take note of the bottom-most PCIe slot (F).*If you are installing a card that requires an additional power supply please look here for assistance. Insert the small black end of each power cable into the clip until they "snap" into place. If your GPU came with power cables t his is where you will connect them (some smaller cards do not require and thus do no come with power cables). Refer back to the black clips mentioned earlier (Figure 2).You may now remove your current graphics card by gently rocking it back and forth while pulling it towards you out of the Mac Pro. This is necessary to accommodate the larger fan on your new graphics card.
Remove the retaining plate that they were holding. Loosen the thumbscrew (D) and the matching one above it.Make note of the two small black clips (C) to the right of the fan, they will be used momentarily. This will cause the metal bar (B) that holds the graphics card in place to also slide to the left. Press this button and slide the fan to the left.
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If you are installing a new Nvidia GPU please install the appropriate drivers before installation.