I initially bought a generic DisplayPort 1.4 cable off Amazon for my Alienware AW2723DF 280Hz monitor.
When I set the refresh rate to 280Hz, the screen has extreme flickering and it is not usable. It is stable at 240Hz.
Please note that the DisplayPort cable that came with the monitor is able to display 280Hz without any issues. Unfortunately, the cable is too short for my needs.
I then decided to purchase the CAC-1069B because it was recommended to me by someone else. They told me this cable was VESA certified and should suit my needs.
Unfortunately, when I use this cable, 280Hz and 240Hz do not even come up as an option. The highest option is 144Hz.
My graphics card is an RTX 4090 ROG Strix so it supports DisplayPort 1.4a.