I think both 104HD and 105HD run at 800MHz.
Can anyone confirm cpu speed? Synrgic website claim 1Ghz. Freescale i.MX51 page claims up to 800Mhz for consumers (600Mhz industrial).
I think that this can be verified with the "Android Analyzer" app.
Perhaps Synrgic have clocked the cpu to 1Ghz with enough cooling. My 104HD runs pretty hot at 800Mhz.