Hyper PI is a small Windows application that lets you calculate the pi value for as many digits as you want.

Since it's supposed to perform just a single operation, Hyper PI boasts a simple interface that's more focused on the overall performance of the app rather than on the actual features.

While it does let you select how many digits of pi you wish to calculate, Hyper PI also has multiple settings to make sure your computer is able to get the job done.

For example, you must choose the process priority (with the standard Windows options included – low, below normal, normal, above normal, high and realtime), but also the number of processors to be used during the process.

Additionally, you have the option to disable multiple Windows services to improve performance of the app, including audio and themes, but also the Windows 7 Aero Glass interface.

As for the pi digits to calculate, you can choose from multiple predefined values, which can be anything from 16K to 32M.

Once you click the “Start” button, Hyper PI starts a process whose duration depends on your settings. It opens a new tab for each processor and seriously stresses up the computer all the time.

Hyper PI works on all Windows versions, but you need a pretty fast computer to use it, especially when choosing a higher number of digits to calculate.

But overall, Hyper PI is quite a handy tool, especially thanks to the fact that it boasts such a user-friendly interface. Too bad it needs such a large amount of computer resources.