Nvidia has a lot of problems with windows 10. does the display come on with the card installed? if so I would try to download the newest drivers for windows 10, if not here is link to all the downloads for all drivers, manuals, bios updates from intel for the board: Intel® NUC Kit NUC5i3RYH I would suggest using the latest bios and drivers for windows 10.
I know this works because i once did it with a NUC i had for a while.
1. +12V and +5V need to be connected via the floppy power conector on the M.2 adapter.
2. The GPU must have a 6 or 8Pin power connector, and it needs to be connected to a ATX PSU, since it can't draw power from the M.2 adapter.
3. The PSU must be switched on manually. Sometimes before the NUC boots, sometimes during Post, sometimes after Post, this is a bit unreliable.
I will get a NUC6i5 to try this again, and i still have the 2 adapters and the GPU, but Intel is taking its sweet time with the BIOS update that fixes this really problematic NUC generation. See all "NUC died within the first few hours" post here or on Amazon.
You've probably seen this on Reddit, i've posted this a couple of weeks back. (not my setup)
Edit: just saw that the M.2 adapter you are using has absolutely no electronics onboard. Maybe there is a handshake problem with the Bus if there is no further electronics onboard.
I have this one
It downconverts PCIe 3.0 4x to PCIe 2.0 4x though, but that's not a problem.
In the BIOS's PCI Configuration it shows:
M.2 PCIe Slot Not Populated
M.2-PCIe Slot Vendor ID:Device ID <FFFF:FFFF>
And nothing shows on the display when connected to the eGPU display port (tried HDMI and DVI).
I follow this (How to power up an ATX Power Supply without a PC!) to jump started my PSU and generate a 12V for the eGPU and the NUC.
From bplus's schematics (http://bplus.com.tw/PDF/p4sm2_ver1_0_20130927.pdf), I'm wondering if the adapter only makes use of 12V:
I guess your observation on my adapter may point out the problem. My adapter has no resistors or capacitors at all! But bplus's and delock's seem to be more complicated.
I'll try to get one of the bplus's or delock's adapters and try again. What's strange is that I tried my simple adapter on a desktop mainboard's M.2 port and it works! Don't know why it works on a desktop M.2 port and not working on NUC5i3RYH. One thing to note is that my desktop's M.2 port is of gen 3 PCIE, and NUC5i3RYH's PCIE is of gen 2.
I'll update my results after trying a new adapter. Looking forward to know about your results on NUC6i5!
Ah yes, the Bplus one only needs 12v. That's that one the hardforumer on his NUC5i5 used, and i couldn't get a hold of it here.
The delock one needs both 5 and 12 volts, delock emailed me about that after i asked. Had to buy a HDPlex 250w because of that. (and for the GPU)
PCIe needs a couple of 3.3 volt lines and the adapter seems to make 3.3v from the connected 5v on the delock. Also it has a Jumper to turn the 3.3 volt rail on or off.
Which is weird, because the NUCs PCIe connector already has a 3.3 rail. (Not enough current? No passthrough?)