Guys i have a question, I'm using a XB271HU which is paired with at GTX 1080, using the displayport cable that comes with the monitor i am able to get 2560 x 1440 @165hz. However the cable is short that i had to purchase a longer cable but upon using it it seems that my refresh rate is capped at 85 Hz and there is no 165 hz at the Nvidia Conbtrol panel. After swaping back the cable i am able to get back to 165 Hz once again. Is there a version for display port and which version i am suppose to be using? If possible kindly point me where can i get the cable thanks.