Hi, is there a WiFi card that will work with the Mac Pro 3,1 that has native support in macOS 10.12 Sierra? My Mac Pro never had an internal WiFi card and I have been using a cheap USB dongle, but it has a rather annoying utility which pops up every time I boot and relies on the USB2.0 port on the rear.
It isn't terribly important, but I do use my Mac Pro as a Media File server for my Samsung TVs using Serviio, which seems to rely on the WiFi for some reason despite one of them being connected to the same network via Ethernet.
You need to buy the following Broadcom BCM94360CD (which is made for a newish iMac I believe) card, this is WiFi AC and bluetooth 4.0 combo card.
And an adapter to allow you to plug this into the mini-pcie slot on the motherboard of your MP3,1. Even if you had no WiFi when purchased new you will have this slot above the CPU heatsinks / below HDD bay 2 and there will be 4 antenna wires typically tucked in behind the top of the motherboard, 3 will be used for WiFi and 1 for BT, the original WiFi card only used 2 wires for WiFi and 1 for BT 2.0 as a separate card.
As the BCM94360CD is an original Apple part there is no need for driver (kext) changes it will work out of the box.
These are the two parts I bought back in October 2014 and have had zero issues with the card since being installed.
I updated to macOS Sierra as well using the unsupported thread. This card does give handoff and continuity functions in 10.10 / 10.11 in a 'supported' release, it still works in 10.12 as an 'unsupported' release.
https://www.amazon.com/gp/product/B00NQAXDW8
https://www.amazon.com/gp/product/B00L35XSMS
I did use the 'random patch program' but there are manual methods around this if you have newer hardware laying around or if you know how to make the modifications yourself.
You need this:
and this:
This is what it will look like when you've installed it.
The adapter + WiFi card and the 4 antenna wires connected to it.