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Is it theoretically possible for a cheapo Mini DisplayPort to HDMI cable or adapter to support resolutions above 1920 × 1200, e.g. 2560 × 1440 (QHD)?

Or is it always electrically-equivalent to a single-link DVI, and such resolutions above 1920×1200 are out of the question?

From empirical evidence, I've tried out some rather expensive brand-name adapter from a local Apple dealer that was marked as HDMI 1.3 compliant with my mid-2013 MacBook Air (5000) and also with X230 (4000), and a QHD monitor, but was only getting a maximum of FHD resulution through such an arrangement.

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1st mistake, trusting Apple with their markup. 2nd Mistake, buying from Apple instead of a reputable and with less margins reseller... –  AthomSfere Jul 6 '13 at 20:45
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Yes, supposedly, it is possible:

http://www.monoprice.com/products/product.asp?p_id=9475&format=2

10ft 32AWG Mini DisplayPort to HDMI® w/Audio Cable - White

Supports "Dual Mode" input with a maximum resolution of 2560x1600

The mDP to HDMI cable above costs 7,50 USD, and explicitly clams to not be limited to 1080p.

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Actually cnst the link you provided clearly stated: > Note that this cable supports a maximum resolution of 1920x1080 when connected to a Mac computer. –  warmth Jun 24 at 2:12
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