Processor speed has a lot more to do with the clock speed, which is measured in Gigahertz (GHz). Clock speed determines the speed of the processor to retrieve and interpret instructions. So, if speed is the main factor for you, you should go for a desktop computer and not a laptop. If you are looking for gaming systems, 3.4 to 4.0 GHz is a good clock speed. An everyday product for basic tasks normally has 1.5Ghz. Likewise, you should choose a speed according to the tasks you are going to perform on the system.