External GPU via Thunderbolt

Ive a Sonnet Express 3 and am getting no GPUs to work.

Ive tried ATI Radeon 5770, NVidea GeForce GTX780 and GT740SC.

Nothing shows up under PCI or Thunderbolt sections of the sys info section under 10.9 or 10.10.

In fact, what does show up is something to the effect of error reading info.

Ive an external power supply so juice is no issue.

Ive read were Intel doesnt want to approve external GPU via TB as theyd rather one buy a strong laptop for this purpose.  Since they own the spec they can do whatever they like.

Of course Im neither here nor there on this as I simply wish for my endeavors to be fruitful.  

At any rate, wondering if any one has accomplished this with any sort of TB case; eternal Nvidea GPU via Thunderbolt on a trash can running 10.9.5?

There are some articles on modifying a driver etc.. for use with this but before trying any shenanigans which I am more then capable of doing, I thought to reach out to my more experienced colleagues.

Hope you have some nuggets for me.

Thanks in advance,