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I want to use my new 27" Display in full resolution. I've tried two different cheap mini displayport to hdmi adapters but they only work with a max resolution of 1080p.
Do I really need an expensive Mini DisplayPort to Dual-Link-DVI-adapter or should i try a mini displayport to displayport adapter to get the full 2560x1440 resolution?

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What display are you using? What ports does it provide and what resolutions does it support? –  Gerry Sep 17 '12 at 10:49
    
Its a Dell U2711 with these ports: HDMI, DisplayPort with audio, DVI-D (HDCP), USB and VGA –  kannix Sep 17 '12 at 10:54
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2 Answers

up vote 3 down vote accepted

Mac OS X should detect the supported resolutions when you connect the display. Your problem might indeed be related to the adapter and cable you are using. According to the HDMI 1.4 spec, standard HDMI cables only support resolutions up to 1080i.

I suggest you use the DisplayPort or DVI port on your monitor instead, and buy the appropriate adapter for one of those.

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Ok I'll buy a mini DP to DP cable and accept your answer if it really works ;) –  kannix Sep 17 '12 at 11:32
    
Nice, the Display Port cable works :) –  kannix Sep 21 '12 at 9:17
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Try picking up a mini displayport to displayport cable like the Accell B119B-007J

Using the display port was the only way I found to get the max resolution.

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