So if I had a dual core 3GHz processor it would be like running at 6ghz?
Yus. Also I think it allows you to have dual screens.
Having multiple proccessors increases speed for one screen and/or allows you to support the number of screens which matches that of the proccessors present.
what the christdo you not know how screens work
Dual core processors (and usually any other multi-core processor) use pipelines and an array of other things to process instructions quickly and concurrently. Modern operating systems utilize multi-core technology and use it to speed up the OS. Dual core processors aren't terribly good in today's standards.
Having a dual core 3ghz processor does not mean that it's running at 6ghz.
Quad core is where it's at.