How to view CPU clock rate in GHz or MHz? I am looking to get the new 12″ MacBook and as a result I would like to know the clock speed (in GHz) my current MacBook Air (late 2010) is running at so I know the processor on the MacBook will cope.

At the moment I know my processor running at the lowest frequency is 1.86GHz (as shown in System Information) and when I look in Activity Monitor as suggested here it only shows me the CPU usage and not the current clock speed. I have also looked at this suggestion but again it does not show me my processing frequency.

The reason why I want to find out the current speed my MacBook Air is running at is because Turbo Charge (explained here) can have it's clock run at various speeds from moment to moment. I have also tried Intel's power gadget software as suggested by @grgarside however my Air's CPU is not supported as shown here.
Intel Power Gadget can show the current CPU frequency.