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Monitor stuck at 144hz on DP?

Star I

Hey there!

I have an ROG STRIX G15 2022 G513RM laptop and a VG259QM monitor. I was using the monitor via the HDMI port on the laptop until now with no issues. 240HZ 1080p. I wanted to try out the G-SYNC capabilities for the monitor, so I bought a Type-C and DisplayPort cable. Connected it to the laptop, and now the monitor only shows 144hz. Why is that?

Is it that the Type-C port is not good enough? Or the cable is bad?

Thanks for the help in advance.