PSP Go - A Bit More Power At Your Fingertips.

The PSP Go can hit up to 480MHZ.

It's unknown what the extra processing power will be used for; the PSP Go will have in-game XMB (much like the PS3) and thus the extra power may well be used to make this option possible. Speculation for PSP Go-only applications are rife given the extra processing but unlikely. It seems the last thing on Sony's agenda is to split the PSP user base.