I have a setup almost identical to this build:
1. AKiTiO Thunder2 PCIe Box
2. EVGA GeForce GTX 750Ti with G-SYNC Support 2GB GDDR5 128bit, Dual-Link
3. GameMax GM450 OEM (GM-450) - 450W power supply
4. Macbook Pro Retina 13 (2013)
I installed the latest drivers from the EVGA website. I connected external display via HDMI and can see my card in Device Manager.
The problem is under a smallest load (starting a game or Unigine Heaven test), the whole system freezes, picture from the external display disappears, although fan on graphic card is still going.
Any ideas how this can be fixed? I took power from the Molex connector. Could that be the problem?