From TouchArcade: 2nd Generation iPod Touch Faster than iPhone
While we had generally considered the iPhone and iPod Touch to be one cohesive platform, as games have started to push the boundaries of these devices, it has become apparent that there are differences in performance between the different models.
Apple has not talked at all about processor speeds for the different generations of iPhones and iPod Touch. Most companies don’t tout the microprocessor speeds of their phones. But, the iPhones and iPod Touch are basically mini-computers