GTX 970 driver problem.

Hello,
I am having some issues with the following configuration:
- Mobo: h97m -g43
- Graphic: GTX 970
- Ram: 16gb corsair vengeance
- dell u2715h monitor
- El Capitan 10.11.6

I have managed to install the OS X properly, post-installation was done with multibeast. Even though I injected nvidia in multibeast, the resolution continues to be smaller. I tried installing nvidia CUDA and Webdriver, but then the monitor turns off on boot. Any solutions to this yet?

Thanks in advance,
Zan