Mine’s a bunch of geeky TL;DR — short version is that two pieces of computer equipment that were ill-advised purchases can substitute for each other in unplanned ways which is quite cool.
When I was first outfitting a MacBook Pro 2018 to use as my work-from-home laptop, it was an upgrade from a vintage 2011 that could no longer run an OS as modern as what the boss’s VPN requires. Apple had changed how periperal devices get hooked up. Old way: 3 regular USB ports, a Thunderbolt2 (mini displayport) for external monitor and/or other purposes, “magsafe” magnetic AC power in, FireWire 800, ethernet port. New way: four Thunderbolt3 ports, have fun! I curse a lot and order adapters so I can hook up my crap.
One of the adaptive devices I ordered was a huge unweildy external card box, what we used to call a “breakout box”, into which I installed a StarTech FireWire card so I could have FireWire on this newfangled thing, since all the computers in my computer collection back to the 1998 ‘WallStreet’ PowerBook G3 can speak FireWire. It worked but took up a lot of desk space and has a noisy fan and at some point I unplugged it.
Fast forward to the declining years (i.e., now) of using the previous laptop as my everyday personal computer, this being the 2011 vintage MacBook. This is a much better machine for travel and general personal enjoyment, with that big 17" screen, standard USB ports (there’s an immense array of USB devices out there and they all have the old style plugs on them), nicer keyboard. One problem: design flaw, the discrete GPU burns out and this model then turns into a boat anchor, useless. I have several live working computers of this model and a closet full of dead ones. I learned how to disable the discrete GPU both to prolong these laptops and to boot some I’d previously relegated to “dead”.
One thing I like to do with my personal 2011 MBPro is output video to our TV set (streaming or from local video file). I have a mini displayport to HDMI cable and a little stand to put the computer on. The newer-fangled 2018 models don’t work with an adapter. BUT I can’t output video from a 2011 if I’ve got the discrete GPU disabled, because it needs that to run any external display device.
I contact a tech advisor who instructs me to snag an Akitio Thunder2 box and an external GPU card. Find one on eBay, yay! Box arrives. Oops, I ordered the wrong thing… this is an Akitio Thunder2 all right but not a box, it’s a hub! It’s a Thunderbolt2 device that gives you FireWire 800, a couple standard USB ports, a passthru Thunderbolt2 port, but no place to hook up a card. It’s a cute quiet flat little device, no fan.
Yeah, it works with a Thunderbolt3-Thunderbolt2 adapter and now I’ve got FireWire 800 for my 2018 work computer. Now if that unplugged StarTech box will work with the older 2011 using a similar adapter, I can put the external GPU in that… (waiting for the card to arrive, fingers crossed…)