...does anyone know the frequency handled by the GPIO pins for either the Psoc 3 or Psoc 5 version...
Yes, the datasheet knows those things. If I remember correctly, for PSoC 5LP, the maximum GPIO frequency is 33MHz. For PSoC 3, I don't know. Please verify by datasheet.
Anyway, to solve your problem, I think you should tell us which ADC you're using and what the maximum expected frequency is.
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In Creator just use the pin component datasheet to get the information you need. Ralf's estimation of 33MHz is correct for all PSoCs.