When I built my Mac Pro 3,1 machine (Early 2008) back in the day, I chose not to get an Airport Extreme card since I only intended to connect it via an Ethernet cable. However, I've noticed that the new Yosemite Handoff feature apparently requires not only Bluetooth 4.0 but also 802.11ac. Unplug your mac, make sure you have the airport extreme card, 2 x tiny screws and the suitable electronic screw driver (make sure its magnetic to avoid losing the screws inside the machine). Pull the hand on the back of your Mac Pro to release the side panel now you can lay it on its side.
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