I recently bought a Asus PB278Q with a resolution max of 2560x1440 for my N73SV.
 
I cannot make it to use this resolution for the external screen, Would anyone know if there is a workaround (either linux or windows) or I am doomed to buy a new computer to get this output resolution ?
(I used the HDMI cable to do my testing)
 
Thanks in advance
 
Arvatarox

Try to update ur graphic card driver, I had the same problem but with another screen, and it's only after the update that I could use his normal resolution, but it was with an VGA cable not HDMI.
You have many programs/websites which detect and check the version of ur differents hardware versions, just google it