Speeds were boosted further when the external GPU was used with an external display, instead of routing the video signal back into the MacBook.
In tests, running inside an AkiTiO Node or Mantiz Venus enclosure, eGPU.io found the 1080 Ti put in benchmark scores ranging from double to four times the speed of a MacBook Pro relying on stock internal Radeon Pro 460 graphics. Of course, you can't actually put a 1080 Ti inside a modern Mac, unless you're building a hackintosh, so an external GPU enclosure is your best chance of accessing this power from within macOS. This is, of course, courtesy of the new Mac drivers that Nvidia just released, which bring the Pascal 10XX series of cards to macOS for the first time. Nvidia macOS 10.12.6 driver & GTX-1050 Ti (Aug 2017) Unigine Heaven and Valley benchmark scores with Nvidia web driver for macOS 10.12.6 used with an Nvidia GTX-1050 Ti card in a Hackintosh. The folks over at eGPU.io are putting in some solid work to make sense of it all ( as spotted by AppleInsider), and they've just had a surprisingly great result with the latest Nvidia drivers, a GTX 1080 Ti, and a 2016 15-inch MacBook Pro. M1 Mac with eGpu : eGPU Razer Core X Aluminum External GPU Enclosure (eGPU): Compatible with Windows & MacOS Thunderbolt 3 Laptops, NVIDIA /AMD PCIe Support. Right now the external GPU market is a bit of a mess, full of hacks, incompatibilities, half-adhered-to standards, and artificial limitations from the likes of Apple.