there's a chance that windows is using chroma subsampling 4:2:0 or DSC to slightly lower the image quality and make more bandwidth for higher refresh rate though, if you're being limited by the type of cable you're using
can you provide info about what type of system you are using? like, a handheld, laptop, desktop PC, and how it's connected to your screen. what cable, through any dock/adapter, etc
I see. If you can find the exact monitor model number on the sticker of the back of the monitor I can investigate how much bandwidth it should be able to support on each port
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That should support up to 246hz at 1920x1080. But if anything drops it down to HDMI 1.4 (such an the cable being old or bad, or any type of adapter/splitter/HDMI switch you may have between the GPU and the screen) then the refresh rate will not go higher than 146hz without DSC or chroma subsampling