Originally Posted by netllama
I'm afraid that your card is definitely not capable of dual link TMDS, and therefore cannot drive 2560x1600. You'd need a 7600GT (rather than the GS) for dual link TMDS support. See the chart at the bottom:
I now replaced the 7600GS with a 7600GT, more precisely one from gigabyte that is here: http://www.newegg.com/Product/Produc...82E16814125025
Alas, same issue: no 2580x1600 support. And, yes, the cable has a full set of 3*8 pins, not the single-link cable.
Any other ideas of what can go wrong here?