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The CPU meter and System AI are free gadgets for Windows 7 (or Windows Vista) that can track your computer’s CPU and physical memory usage. The CPU Meter is very basic with a two dialed display that presents your PC’s current status in a percentage style format. This gadget is included with the Windows 7 /Vista operating systems.
Alternatively, the System Control A1 is a more advanced version that can support up to eight CPU cores. In addition to showing you the usage information, it displays the time in 12 hours and 24 hours mode.