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The question is which does more monitors support: a non standard frequency (57) or a nonstandard bit depth (i.e. 22)?
Good point. Perhaps only the output from the PC could be dithered to 22bit, while the output from the TH2G maintains a 24bit signal (which is really lower bitrate but sent as higher). Based on the assumption the bandwidth limitation is in the input.
Ah, hmm.. you made me think of something. The output bandwidth is definitely short on the video card -> Th2Go since that's the part that it served by only one dual DVI cable.
However, the th2go -> monitors are using 3 DVI cables which easily handle 1680x1050 easily on their own.
So what they need to do in the next update is bump the Th2Go to output 1680x1050 at 60Hz instead of 57Hz. They can do this either by outputting some frames twice (three times over a second), or by using a lower bitrate like 22bpp (but then the video card drivers itself might not support that?) and upconverting it to 24bpp at the Th2Go (a trivial byte shift in a few places, quite easy to implement).
Either way, the monitors should be getting 60Hz, since it's unacceptable to most that people are buying monitors which end up not working with the Th2Go (even if the specs do say they support less than 60Hz, the monitor manufacturers clearly don't always test lower frequencies).