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OCCT is the most popular CPU/GPU/Power Supply testing tool available. Free to use for the end user, it has 13M downloads since its creation in 2003. It monitors your computer while the test is in progress, and protects your components by stopping automatically once a component reaches a critical temperature.

Features:

· Up to 16-core support ( for instance, up to a Quad-Kentsfield or an Octo-Conroe )
· Customizable tests ( Duration, Priority, CPU or RAM, ... )
· CPU and Motherboard detection
· Monitoring support through 3rd party application ( i.e. MBM5, Speedfan and Everest Ultimate Edition 3.50 or above )
· Can produce graphs showing temperature and voltages during the test : Unique feature !
· Multi-language support

OCCT is available in a Pro version, for professionnal. This version includes the following features:

* 3 different test types
o CPU = no RAM tested, alot of heat generated on the CPU, errors are usually CPU-centered
o RAM = Maximum error detection, tests the whole chain CPU-Chipset-Memory
o Mix = CPU and RAM alternated
* 3 tests modes
o Auto = 1h long Mix test
o Custom (Infinite) = Infinite loop of the test type of your choice
o Custom (fixed) = A test of the type of your choice, and of a duration of your choice
* Integrated monitoring and System information thanks to CPU-Z and HWmonitor engine
* External Monitoring Program support through plugins (Everest, Speedfan, and many more)
* Graph output showing temperatures and voltages of your computer