2012 Mac Mini [3rd,4C,Q] + GTX 970 @ 10Gbps-TB1 (AKiTiO Thunder2) + Win10  

System specs

Mac mini (Late 2012), 2,6 GHz Intel Core i7-3720QM, 16 GB 1600 MHz DDR3.

eGPU hardware

Modified AKITiO Thunder 2 by Bizon
Zotac gtx970
TB2 cable
Iiyama 27" @ 2560x1440 / 70hz

Install

Plug&play on Windows
Latest Nvidia drivers

Not using macOS on this device.

Benchmarks

Enigine Heaven 4 (1680x1050, Medium, 8x AA): 79 FPS / 2002 Score

CSGO, 1600x1400 with gpu scaling to 2560x1440.
Antialising 8x, Antistropic 16x, everything else low
Fluctuating between 100 and 300 fps (capped to 300).
Benchmark: https://www.hltv.org/blog/11862/one-of-the-best-method-to-check-your-fps-in-csgo-new
160 fps average

Guildwars 2 is working fine with medium settings in QHD resolution.

Comments

This is my old setup for gaming I used more than 6 years ago.
It did a really great job (mostly guildwars2 and CSGO) rather than the embedded int HD GPU (which is unusable for gaming).

It have now a second life as I gave it to my son and it still provide pretty decent efficiency.