I don't care about power management for my graphics card. Everything works just fine without it. I did not have to make changes to nvdastatup.kext. Boot with nv_disable=1, make changes - you can rename kext to kext.noload or whatever if you prefer, update system cash manually or using kext...
I had to remove AppleGraphicsPowerManagement.kext to stop kernel panic when loading NVDAStartup.kext. My config is above. Hope it helps.
Nvidia GTX260
PS For 285. You can try new drivers https://images.nvidia.com/mac/pkg/378/WebDriver-378.05.05.25f03.pkg
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