Currently Being ModeratedFeb 6, 2013 9:09 PM (in response to mp4430)
In the upper right of this page click Support, then Tech Specs, input the serial number of your iMac and you will find what you need.
Currently Being ModeratedFeb 7, 2013 11:17 AM (in response to rkaufmann87)
It says that it will suppor "a" external display at 2560x1440 resolution.
Does that mean that it will only support One external display?
Will it run Two external displays at the 2560 x 1440?
Currently Being ModeratedFeb 7, 2013 11:56 AM (in response to mp4430)
Based on what you have read I would say "a" means one. However I would strongly recommend contacting OWC (OtherWorld Computing at www.macsales.com) to see if they have some other solutions available and if so what they may be. OWC specializes in Macs and what they sell they thoroughly test prior to.
If you find it necessary you may need to upgrade to a newer Mac that support 2 or more external displays via Thunderbolt. Not cheap but doable.