Dual Dell Ultrasharp 27" screens won't both go to

System: MacPro Server 2012/10.8/ATI Radeon HD 5770 1024 MB graphics card
Screens: 2 Dell Ultrasharp 27" U2713 (both show on the utlities menu that they are capable of 2560x1440)
With three connections on the ATI card, only the DVI port connected to DVI port on the screen reliably give 2560x1440 (60 Hz is only option)
When the other screen is connected via mini Displayport only provide 1920x1080 (60 Hz is only option)
How can I get 2560x1440 off of the minidisplayport? I have tried the DVI cable that works on the DVI-DVI screen and it steps down, and I have tried a brand new mini Displayport to HDMI on screen cable and it also steps down? If I switch screens also, only the DVI-DVI provides full 2560x1440. Argh!
Is it possible that only the DVI port can handle 2560x1440, and the MiniDisplayport maxes out? Is there a better quality of HDMI required to get 2560x1440?
Thanks!!!

Looks like it handles DisplayPort. One of those Monoprice Mini DisplayPort to DisplayPort cables should do the trick.
Connectivity
Interfaces
VGA
DVI-D
DisplayPort
4 x USB 2.0

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<Edited By Host>

you have a notebook, not a Mac Pro workstation.
MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro

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Dual Dell Ultrasharp 27" screens won't both go to

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