Philips 43PUT8217 User Manual page 29

HDMI Ultra HD to Optimal or Standard, the TV UI
selection Optimal or Standard will turn off VRR
support in TV.
* Note for AMD Graphics card users:
If you connect your computer to TV via HDMI, please
ensure following settings in graphics card used to
have proper performance.
- If graphics card output video is 4096 x 2160p or
3840 x 2160p and RGB pixel format is used, RGB 4:4:4
pixel format studio (limited RGB) shall be set in
computer graphic card.
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