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OCCT (OverClock Checking Tool) 3.0.0
On this page you can download OCCT (OverClock Checking Tool) 3.0.0.

Version: 3.0.0
Date added: 2009-02-05 02:41:43
File Size: 3,5 MB
OS Support: Windows 2000, Windows Vista, Windows XP
License: Freeware
Downloads: 123734 downloads
Software type: Generic Utilities

You are here: downloads category selection OCCT (OverClock Checking Tool) 3.0.0

Software Description

OCCT (OverClock Checking Tool) is a CPU stability testing program.

Attention - this is the OLD download section of, click here to visit the new and up-to date one.

Its features :

  • 3 different test types
    • CPU = no RAM tested, alot of heat generated on the CPU, errors are usually CPU-centered
    • RAM = Maximum error detection, tests the whole chain CPU-Chipset-Memory
    • Mix = CPU and RAM alternated
  • 3 tests modes
    • Auto = 1h long Mix test
    • Custom (Infinite) = Infinite loop of the test type of your choice
    • 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

Changelog (Since 2.0.1) :


  • OCCT's main UI has been completly revamped
  • Graphs now shows a 2nd line showing the CPU usage / FPS during the test.
  • CPU usage is now instantaneous instead of an average since the start of the test
  • OCCT now has 5 different tests. The descriptions are at the end of the changelog


  • Entirely revamped - now based on tabs, and completly modular
  • Now has a small help module - just move your mouse around OCCT's window, you'll see


  • The built-in engine has been updated - lots of new hardware are now supported
  • Alot of bugs are fixed, included the famous "3 cores out of 4 detected"


  • Graphs now shows a second line showing the CPU usage/FPS during the test
  • A legend explains everything
  • The test configuration is now entirely present in the graph's subtitles



  • The original, inherited from previous versions of OCCT
  • Now Core i7 compatible
  • Optimized


  • The very same as IntelBurnTest, based on a test provided by Intel
  • It will make your CPU hotter than never !
  • 32 and 64 bits support


  • Home-made test written in Direct3d that will make your GPU really hot - this test is similar to ATITool and Furmark (thanks to Furmark and JegX for his support and for the aborted partnership ;) )
  • Will make your graphic card real hot - especially the GPU
  • Has an error detection mode similar to ATITool
  • SLI and Crossfire support (Just enable Fullscreen mode !)


  • Again, Home-made test written in CUDA that'll launch a MemTest86 or MemTest86+ like test on your Graphic card memory and report any error found
  • Requires a Nvidia Graphic Card, and a GeForce 8 or Higher !

Power Supply

  • Dedicated to power supplies - it'll launch GPU:3D and CPU:LINPACK at the same time to load your power supply. BEWARE, THIS TEST IS REALLY DEMANDING !
  • This tests demands 30 to 40% more power than crysis on a quad-core system with an SLI graphic system installed.

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