Amazing setup!!!
Have you tried to reinstall the drivers of the monitors?
Another option is to force the resolution by Control Panel.
At the NVIDIA's site I have found an information about max resolution:
# Dual integrated 400MHz RAMDACs for analog display resolutions up to and ...
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- 16 Oct 2007, 23:28
- Forum: Multi-Monitor Gaming
- Topic: TH2GO digital cannot get more than 2400*600 en 7800GT?!
- Replies: 17
- Views: 6738