Dashboard Widgets – iStat pro

The ultimate system monitoring widget, consisting of nine sections which can be shown or hidden.

It features highly detailed information on CPUs (up to eight cores), memory, hard drives, IP and external IP, bandwidth, battery, wireless keyboard and mouse battery, uptime, temperatures, and fans. You’ll know exactly what’s going on inside your Mac!

Apple – Downloads – Dashboard Widgets – iStat pro

A must have widget. I’m not sure how I survived without it!