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I have a BenQ GW2765HT monitor (specifications) connected to an AMD Radeon R5 230 graphics card (specifications, driver: 15.200.1046.0). When I change the resolution to the native monitor resolution of 2560x1440 the text is unreadable. Why? Do I have to change the graphics card? If yes, what should I look for?

OS: Windows 7 Professional Service Pack 1. Cable: DVI-D Single Link.

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You’re using a Single-Link DVI cable. This is not enough for 2560×1440@60Hz:

Single link DVI employs a single 165 MHz transmitter that supports resolutions up to 1920 × 1200 at 60 Hz.

(Wikipedia)

You’ll have to get a Dual-Link cable. IIRC there’s no way of detecting the cable type, so the monitor just won’t receive all the data, resulting in a corrupted image.

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Use another cable.

Duel link DVI or DisplayPort

DVI single link support (1440 × 900) @ 60 Hz.

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I have found an article (Dutch) where it says this about your graphic adapter:

Maximale resolutie:     2560x1600 (WQXGA)

According to Wikipedia in Digital Visual Interface, WQXGA is a display mode available in dual link only.

If you are using a single-link DVI cable, and your card can only achieve the resolution of 2560x1440 using WQXGA which is a dual-link mode, then it is clear where is the problem.

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