2017 13" MacBook Pro [7th,2C,U] + GTX 1080 Ti @ 32Gbps-TB3 (Sonnet Breakaway 650) + macOS 10.13.6 & Win10 [neaumusic]  

System specs

2017 Macbook Pro (No Touchbar)
Intel i5-7360U (2.3ghz - 3.6ghz dual core 15W TDP)
iGPU: Intel Iris Plus Graphics 640
dGPU: none
macOS 10.13.6

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eGPU hardware

Enclosure: Akitio Node Pro
Enclosure: Sonnet eGFX Breakaway 650W (Firmware version 25.1)
Nvidia GTX 1080TI OC ROG STRIX
2m CHOETECH active TB3 cable, seems to work flawlessly
1TB SSD Samsung T5

• 100GB exFAT --> NTFS via VMWare Fusion (Windows + Restore Points)
• 50GB APFS Time Machine backup (macOS)
• 850GB exFAT (Z:) SSD SHARED for games and a full Windows Dropbox backup

256GB Mac Internal SSD

• Selective sync Dropbox (separate from Windows external Dropbox)
• Applications etc.

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Hardware pictures

(picture is before rEFInd "spoof os x version" to fix flickering logo and screen glitches)

Thunderbolt, Nvidia, eGPU, Boot Camp

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Installation steps

For macOS:
Simply followed GitHub macOS-eGPU instructions, making sure to follow them directly.
If you get black screen, unplug DisplayPort to monitor, shut down, unplug eGPU, plug eGPU when on Desktop, and possibly log out/in
Lack of DirectX support makes it pointless, I manually plug HDMI to usb hub and remove eGPU before power on

For Windows:
This took a long time, and by now I'd reinstalled everything 5x times and thought I possibly bricked my internal display (LCD burn-in logo).

I recommend getting everything from this checklist

• Win10_1803_English_x64.iso
• Windows Support software (from Boot Camp app menus)
• Intel Thunderbolt Driver NUC software 17.x+
• DDU (Display Driver Uninstaller)
• Nvidia 1080TI x64 driver
• rEFInd from SourceForge (open-source contribution, unlocks Intel iGPU firmware on bootload screen)
• VMWare Fusion / WinToUSB.exe for Windows To Go (external SSD) see 9to5mac's YouTube Tutorial
• Unigine Heaven (benchmark)
• HWiNFO64 (hardware info, if you need it)

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1. Install rEFInd, uncomment "spoof os x version" in refind.conf after install - might have to run `mountesp` to view the ESP partition in Devices
2. Install Windows with kb/mouse attached
3. Install Boot Camp drivers (Windows Support)
4. Install Intel Thunderbolt 17.x+ to recognize enclosure
5. System Restore Point. Just do it.
6. Boot into Windows Safe Mode (Restart holding Shift -> ... -> Safe Mode, Option boot on restart)
7. DDU clean and restart (make sure eGPU stays unattached, also disconnect usb hub HDMI if any)
8. Option boot to Windows (if you have rEFInd already set up, it would spoof os x but you don't want to yet)
9. Plug in eGPU, install Nvidia driver
10. On restart, just let rEFInd load up and everything should work beautifully!
    rEFInd is open-source, activates integrated graphics to manage internal display, and prevents serious problems
11. Display Settings -> only show on monitor 2
12. Nvidia Control Panel -> enable 165hz and Gsync

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To enable external (Z:) SSD SHARED in Windows 10

1. right click Start button -> Disk Management -> delete and re-add the exFAT partition via right click
2. remove hidden attribute, Run -> `diskpart` -> `list volume` -> `select volume n` -> `attributes volume clear hidden` -> `exit`

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Benchmarks
1440p medium-high CPU settings (without usb hub HDMI plugged in -- definitely bogs down system)

Unigine Heaven (relies on DirectX)
macOS: 7-10FPS
Boot Camp: 130-150FPS

PUBG
Boot Camp: 70-100FPS

League Of Legends
Boot Camp: 130-230FPS

Rocket League
Boot Camp: 165FPS

Chivalry Medieval Warfare
Boot Camp: 96-120FPS (UDKEngine.ini "smooth" to unlock FPS, see steam groups "thechivclub")

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Comments

Originally had Akitio Node Pro, but couldn't get things to work correctly. Not sure if user error or I had a defective unit, but I could only get the enclosure recognized, not the card itself.

To save a lot of time, I didn't install Dropbox, but ultimately made sure to create Time Machine backup and Restore Points at every major step. 

The Sonnet is amazing, very quiet when inactive. I tend to unplug at night (strange PSU charging up/down sound), and I'm testing a longer cable (2 meter CHOETECH cable TB3 for $50)