hp
WiFi-only HP TouchPad gets overclocked to 1.5Ghz
However if you are willing to load a custom kernel up on to your WiFi only HP TouchPad, it appears that you will be able to overclock your processor from 1.2GHz to 1.5GHz, giving you the same speeds as your TouchPad 4G friends.
If that 0.3GHz bump in speed increase is essential for you, head on down to PreCentral.net for the documentation on how to go about getting the custom kernel loaded up on your tablet.