In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Umm...
The software supports up to 110Mhz, but there was some discussion this past year of that recommended not pushing that high.
I believe that it might overstress the SX-Key or SX-Blitz's internal hardware which includes an SX chip.

Apparently, the SX Ubicom chips are really not engineered to surpass a maximum of 100Mhz and not really well suited over 80Mhz without including specialized EMI and power consumption features.  The heat builds up and the interferances become greater.

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