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I just got a Dell U2713hm to hook up to my Mac Book Pro. I thought it was a 2560x1440 monitor but I'm only getting 2048x1152.

I'm using the mini display port to VGA, am I just stuck with the lower resolution?

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up vote 1 down vote accepted

It's probably a limitation of your adapter. Many cards have a 400MHz DAC for the VGA output which only gets up to 2048x1536 or so. Try a dual-link DVI cable? (Single-link DVI or HDMI won't get much above 1920x1080 so you will need a dual-link cable.)

Edit: it you're using Apple's official adapter, it should go up to 2048x1536. That will still only get you about 3 million pixels per frame. If you want 2560x1440 you need something that can handle 3.6 million pixels.

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I have the dual-link DVI adapter by apple (store.apple.com/us/product/MB571Z/A/…) and a DIV-D (24+1) cable. For some reason the image is blurry on a high resolution (in Mac's display settings it shows 2560x1440, but on the Dell menu it shows 1280x1440). Any idea? – galchen Feb 27 '15 at 12:41
    
Unfortunately, the Apple Mini DisplayPort to VGA adapter only goes to 1920x1200. From Apple Mini DisplayPort adapters: Frequently asked questions (FAQ): 2. What is the maximum resolution available for use with the Apple Mini DisplayPort to VGA adapter? The resolution available with the Apple Mini DisplayPort to VGA Adapter is 1920 x 1200. VGA displays that use higher refresh rates (such as 85 Hz) at resolutions of 1600 x 1200 or greater may not generate video properly until you lower the refresh rate. To be clear: That's not VGA's fault. ;^) – ruffin Oct 11 '15 at 1:08

The problem is definitely the mini display port to VGA adapter.

I have achieved 2560x1440 with the Dell U2711 and a Macbook Pro by using a DisplayPort to DisplayPort-Mini cable.

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