I don't know why Canon does the things it does, but outputting is outputting. If the C500 is spitting out a 10-bit uncompressed signal from HD-SDI ports with a Digic DV III, then the processor is not the limiting factor.
I think that you miss 3G-SDI HW, these outputs are not from DIGIC DV III.
If you turn off 3G-SDI than C500 (I think) output only HD-SDI in 8bit.
In specification are these monitor ports as "monitor video out", HD-SDI out in specification C500 has only 8bit.
So I think that the C500 monitor outputs are from another HW, it is not direct output from DIGIC DV III.
But yes, I hope that I'm wrong .-) .
edit: for example hasn't the monitor video out an embeded timecode? I don't know but this is monitor only output in specification.
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