Wifi and Bluetooth Card Installation In a 4,1 or 5,1 Mac Pro
Begin by disconnecting your Mac Pro's power supply and any other devices currently connected your Mac Pro. Remove the side panel of the computer. Near the bottom you will find the processor tray. There are two switches on the front, simply press them in so that they point out towards you. This will unlock the tray, allowing you to pull the entire thing out in one piece.
With the tray removed your computer should look like Figure 2. Note the Wifi card highlighted on the left and the small Bluetooth card on the right. Also note the metal dividing column in the center. Later we will be passing wires behind the column.
Using a small screwdriver undo the top and bottom screw on the left side of the Wifi card. Between the two screws you will see three gold antenna connectors. Disconnect these by lightly pulling them towards you, it should not take much force. With everything disconnected from the left side of the card simply slide the entire Wifi card to left, removing it from its slot and set it aside.
Locate the Bluetooth card on the right side of the computer. Use the same screwdriver to remove the single screw holding the card in place. Remove the single gold antenna connector. Pull the Bluetooth card straight out towards you. There is an adhesive substance on the back, but a light pull should be enough to remove it.
Grab your new Wifi and Bluetooth card. This will be going in the slot where your old Wifi card was. Attach the antenna connectors to the 1st, 2nd, and 4th circular antenna ports as shown in Figure 5. Attaching them properly can be quite frustrating, take your time and do not use excessive force. Your new card came with an additional long antenna wire. Connect this to the 3rd port. Once all the antennas are connected slide the entire card into it's port and screw in the bottom screw. There is no hole for a top screw.
You will have noticed that there is a long black wire on your new Wifi and Bluetooth card. This is the Bluetooth wire. Feed the long antenna wire and the Bluetooth wire behind the dividing column seen in Figure 2. Plug the Bluetooth wire into the port where your old card used to be with the wires toward the top. Plug the antenna wire into the antenna connector that used to be attached to your old card. Use a small piece of tape to ensure they stay securely connected. Tuck the remaining wire behind the black clip to the right so it all stays in place. Installation complete! You may now slide the processor tray back into your Mac Pro, replace the side panel, and reconnect your power supply and any additional devices.
If you also use your Mac Pro to boot into Windows be sure to download the Boot Camp 5.1 drivers from Apple. Once you have completed the download install the Broadcom drivers included in the package while booted into Windows.