I did it with an USB 3.0 Stick. That schould not be the Problem.
I think you have to remove the GTX 950, install El Capitan and then the nVidia driver. After installing the driver you can put in the GTX 950.
Sometimes it helps to renew the installation stick (format it an run Unibeast).
I think you have to specify a vendor.
Actually i got my system working with this Guide. But I got a problem with sleep/wake. I can put the machine to sleep but if I try to wake the system up it's starting and goes back to sleep.
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