And just so the definitive answer is on the Web somewhere (I hadn't been able to find this out in advance, despite months of trying), Xorg 7.1.0 will drive the panel at its native 2560x1600 even with the open-source "nv" driver -- you don't need the closed-source "nvidia" one. Very modern Xorg does need an "Option DisplayBlanking" line in the Monitor section of xorg.conf, though.

Peter