EGPU + Nvidia Webdrivers not loading properly

[w4vz]

Hello Everyone,

 

My first post I am trying to setup an EGPU for my Macbook Pro Retina display

 

My config: MBPRD mid 2012, 16 go ram, Intel I7, internal GT650m with Akitio Thunder2 + EVGA GTX770 on thunderbolt 1 under yosemite 10.10.1

 

I managed to get it working with the apple stock drivers but it was not very stable: after about 20mn the computer would freeze/restart so I decided to give a go to the official web drivers.

I have experiemented with a few packages including the latest WebDriver-343.02.01f01 but so far everything has been a disaster and it is alway the same issue:
The issue comes when I modify the NVDAStartup.kext. As soon as I modify it and restart a bizarre thing occurs:
-About half way through the OS loading bar, the screen suddenly doubles in resolution (everything is really small) and it is almost like there is no acceleration at all. refresh rate is unusalble. 
-OS X sees the GT650m under "about my mac" but does not see the GTX770. 
-Looking at the NVIDIA web driver panel nothing appears; not even the GT650m (Hence poor refresh rate I guess): It looks like the drivers are not loading correctly and/or detecting the cards somehow which makes me think it out be an easy fix but my knowledge is very limited.

reverting the NVDAStartup file does not fix the issue but reinstalling WebDriver-343.02.01f01 and everything goes back to normal but I do not have the EGPU of course.

i heard about some startup commands but my knowledge is extremely limited there. I am repairing permissions every time and also tried to clear the cache under terminal but nothing works. Also tried reseting PRAM/SMC.

Any thoughts would be greatly appreciated.

Happy new year !