FCC Archives Show PlayStation 4 Dev Kit with 2.75 Ghz Max Clock Speed
A schematic and spec sheet of the PS4 Development Kit appeared on the page of the Federal Communications Commission. You can see them above and at the bottom of this post.
Most notably we learn that the the maximum clock speed of the machine 2.75 Ghz, even if we don’t know what the actual speed of the final retail version of the console will be. That’s a pretty decent number for a console, though it’s most probable that the final version of the hardware will be different in some way.