As far as I know, it's been 3.0 from release and some time before.
But, there was a very early indication during development, that showed a wee bit lighter specs, and I do think it was a lower processor speed at first. That was merely a prediction at that time though. Maybe that's the one you meant. I don't recall it being after a patch.
It says 3.0Ghz on my box version and that's before any patching, so why would they print it on the box if it hadn't been like that yet?
I reckon you got the early prediction in mind, then.
And why it got higher, well.. cause the game turned out to be a little heavier.
Regards,
Fred