Hi, is there a limit on TDM resolution for a 2009 27"? I'm building a gaming machine to sit alongside my 2009 27" and want to make sure this will work - otherwise I'll sell the 27" off.
The limitation should be the native resolution of the screen, which would be 2560 by 1440.
This article may be relevant, too http://support.apple.com/kb/HT3924#12
from that article:
The Mini DisplayPort port on a supported iMac can receive DisplayPort compliant video and audio signals.