Hi everybody.
I'm new to this forum. At least as an active user. Reading the forum I'm here for ages already. Therefore: Thanks for all the help during the last years...
But now I'm stuck with a problem that I can not get fixed. No matter how much I read here nor how much i google...
I have a MacPro 4,1. It's flashed to MacPro 5,1. Otherwise it is completely stock. I run Sierra 10.12.4, no modifications.
Playing some games once in a while, I wanted to have a stronger graphics cards than the stock ATI Radeon HD 4870. So I bought a MSI Twin Frozr Gaming Geforce GTX 770. Should be much faster.
I installed the card. Booted to macOS. Picture on DisplayPort all fine.
I installed the latest nVidia WebDriver. It asked for permission to install the latest driver 378.05.05.05f01. I installed it. Rebooted to macOS. Picture on DisplayPort all fine.
And here the trouble starts. As with many others, "OS X Default Graphics Driver" is selected. I can select "NVIDIA Web Driver". My Mac restarts. And "OS X Default Graphics Driver" is selected again.
Tried all things I could imagine. No change.
Graphic performance is lousy. FPS in Cinebench dropped from 50fps with stock ATI 4870 to below 40fps with new GTX 770.
Please help! (as mentioned, I'd like to keep my MacPro unmodified with alternative bootloaders or the like, as I need to use it for my work, which has very high security requirements - I'm a bit worried about alternative boot loaders or the like...).
Thank you very much!!!!!!
flegomatix