Apple made a big deal about the iPad's A4 running at 1GHz, but they've never said how fast the iPhone 4's processor is. In the teardown, iFixit mentions that the iPhone 4 uses an A4 but never gives a clock speed. Has anyone been able to find out how fast it actually is?
The iPhone 4 is based on the same processor that is seen in the iPad and has a clock speed of 1Ghz.
The iPhone 4 also has 512mb of RAM which is double that of the 3GS and although never officially announced also double that of the iPad.
Though it's not confirmed, most sources claim that the A4 in the iPhone 4 is the same processor that runs the iPad, clocking in at 1ghz as you suggested.