What connection do you use? I just purchased QNIX (2560 x 1440) monitor for my 2011 late MBP 15". But I can't seem to get 2560x1440 resolution. The maximum I can get is through HDMI at 1920 x 1200. With DVI to Thunderbolt connection, it gets 1920 x 1080 resolution.
I would appreciate knowing how you connect your 2011 MBP to Dell monitor.
Thanks.