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ROG Swift PG278QR & ROG Zephyrus GX501 @ 60hz+?

Level 7
Hi all,

Having an issue running my PG278QR from a Zephyrus GX501.

When using a type-c to DisplayPort cable in this setup, set to 144hz, opening a game causes the monitor to flash between a black screen and the game uncontrollably.

I remember having this with my PG278Q plugged into my rig using a 3rd party DisplayPort cable - using the original, supplied DP cable solved the issue and it has been fine since.

Obviously the original DisplayPort cable won't plug in to the GX501, so what are my best options for running this monitor at anything over 60hz from this machine?
HDMI isn't allowing anything higher than 2560x1440 at 60hz.
Is a type-c dock with DisplayPort out an option?

Any help would be great!