Does the 27in iMac with radeon 4850 support 2650x1440 external displays?

I have access to a Dell u2711. I connected it to my iMac 27in, using a dual link DVI cable using the mini DisplayPort adaptor to DVI. I cannot get it to configure higher than 1920 x 1080. I hoped to be able to use the Dell for additional editing space, but require it to be supported at the max resolution. Has anyone been able to successfully attach the new Dell to the 27 in iMac?
Thanks in advance for your help!

Be aware that single link DVI (and thus the mDP to DVI adapter) does not support 2560x1440. To use that rez, you will want to use a DisplayPort monitor (like the Dell U2711). With a displayport monitor, all you have to do is buy a cheap mDP to DP cable and you will be set.
If you really (and I mean really) want to use DVI, you must buy the $100 dollar Apple Dual Link DVI adapter. However, be aware that the mDP to DL-DVI converter has MAJOR issues.

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