Resolution problems with HDMI

OK.
Equipment: Syncmaster 305t delivered up to 2560 resolution with the same cable when connected to Windows machine (will be relevant).
New Mac Mini with HDMI out and HDMI to DVI converter (the one apple bundles). It LOOKS like a DVI-dual (I think the pin arrangement is different according to google images).
I can't get anything more than 1280 offered to me by System Preferences.
Called apple and they suggest that I buy the Thunderbold to DVI-dual adapter. Willing to do so but skeptical.
Questions:
1) Does anyone know if the bundled HDMI to DVI in Mac Mini 2011 is a DUAL LINK DVI?
2) If it is single link, shouldnt I still be getting something better than 1280?
3) Anyone else out there using the HDMI to DVI adapter bundled with Mac Mini? Whatcha getting for resolution?
Thanks,!

Whoops sorry Zyriab - of course you are right -
I get 1280x800 offered (this is highest resolution) - Dual DVI is supposed to get me 2560x1600 (the most the monitor is capable of).
It seems I should get 1920 x 1080 even if the HDMI adapter is Single Link DVI, right?
Remember, the connectors and cable supported 2560x1600 from my PC on windows - so it isn't the monitor or the cable.
Thanks much

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