I've got an XPS 9550 and I have a HCK T7000+ screen that has a native resolution of 2560 * 1440.
The dell computer is not able to drive this screen at a resolution higher than full hd on the hdmi port.
I've tried with a macbook pro HDMI with the same screen and same cable, it drives it perfectly at 60Hz.
If I create custom resolution, it will always say that the bandwidth exceed the bus speed.
Is that normal for a computer of this price?