CNI

Do any of you guys know how to install the nvidia drivers on a rMBP without a dedicated graphics card? I am looking into building this, and because i was planning to do a eGPU setup when i bought my mac, i didn't wanna "waste money" on the 750m. I hope you can help me.

Sorry, i am very new to this eGPU setup thing. I am atm doing some research. I can't install the nvidia web driver on my rMBP 2014 15" because i have the model without 750m. Isn't it possible to do eGPU at all then?