What about the original cable? Does it reach 144hz? Try changing it through windows Screen resolution settings.
ASUS Maximus VI Formula - i7 4770K - H80i - MSI R9 Fury X - HyperX 16GB Ram - 250GB + 500GB Samsung 840 EVO SSD - Benq XL2730Z 2560x1440p 144hz Freesync - Seasonic 1000w 80 Plus Platnum...