Set 24Hz 12 bit in NCP. Then 60Hz 8 bit. When you play a 24Hz video, it will use 12 bit. If you use madVR to control refresh rates and resolution, it will auto switch desktop at 60Hz 8 bit and video at 24Hz 12 bit. Be aware the setting does not survive a reboot using any newer drivers. You have to reset it or use 385.28 which does retain the setting. 12 bit will most likely introduce banding and you are better off with 8 bit unless you have a rare true native 12 bit display. Most are 10 bit at best.
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