What about Thunderbolt 3?

We tried a Razer Core on a MacBook but it wouldn't work.

Works great with the Razer laptops though!

(BTW, you can't even buy any Mac with a decent GPU anymore, no matter what the form factor!)

It seems like the Akitio Thunder 3 would work -- did you try that one? I guess you would need a MBP with thunderbolt 3 then.. so 2016 models from like 3 months ago then?

You can't even hackintosh a Mac with a decent GPU any more, since NVidia hasn't put out drivers for their 1xxx cards for OS X.

Oh, really? Do they have any plans to?

If they are, they're not telling.

In theory the nvidia out-of-os x drivers are for people using their cards on the pre trashcan Mac Pros. In practice they allow you to make yourself a decent hackintosh desktop. Or used to. Maybe the 1xxx cards don't work on the old Mac Pros, in which case i don't think nvidia can justify continuing putting out those drivers.

Who would this hurt? Apple. Very slowly though. Most people running hackintoshes are opinion leaders wrt to tech stuff, and when they switch to Linux or Windows, Apple will lose more mind share.

No (recent) offical macs are capable of installing a nvidia PCI card

Yeah but a good bunch of the pre-trashcan Mac Pros are still in service. And those do take PCI Express cards. Apparently NVidia felt it's a market worth serving, since you can still get Sierra drivers from them for anything before the 1xxx series.

Okay, the drivers are labeled "for Quadro", but they support basically everything.

Even with Thunderbolt 3, running at 40Gbps full duplex?

That's about equivalent to PCIe 3.0 4x, or PCIe 2.0 8x.