OCCT (OverClock Checking Tool) is a hardware stress testing and monitoring utility for Windows developed by OCBASE. It is designed to test the stability of CPUs, GPUs, memory, and power-related components while monitoring temperatures, voltages, fan speeds, and other system sensors.
OCCT can be used for troubleshooting hardware problems, checking system stability, and evaluating systems running at stock or overclocked settings.
Key Features
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CPU Stress Testing – Apply intensive workloads to the processor to check stability and detect errors.
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GPU Stress Testing – Test graphics cards under demanding workloads to evaluate stability and thermal behavior.
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Memory Testing – Stress system memory to help identify memory-related errors and instability.
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Power Testing – Apply combined CPU and GPU workloads to place a heavy load on the system's power delivery.
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Combined Testing – Run multiple hardware tests together to evaluate overall system stability.
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Real-Time Monitoring – Monitor temperatures, voltages, fan speeds, frequencies, and other available sensor data.
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Customizable Tests – Configure test duration, workload intensity, and other testing parameters.
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Error Detection – Detect calculation and stability errors during stress tests.
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Monitoring Graphs – Display hardware sensor data in real-time graphs and test reports.
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Test Reports – Review test results and detected errors after a test has finished.
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Hardware Detection – Automatically identifies supported CPUs, GPUs, memory, and other system components.
User Interface
OCCT uses a dashboard-style interface with separate sections for different hardware tests and monitoring functions. Each test provides configuration options before starting, while sensor readings and graphs can be viewed during testing.
The interface provides both simple presets for quick testing and additional configuration options for users who need more control over workloads.
Installation and Setup
Download and install OCCT on a Windows PC, then launch the application. OCCT automatically detects available hardware and monitoring sensors. Select the component or test you want to evaluate and adjust the available parameters before starting the test.
How to Use
Open OCCT and select a CPU, GPU, memory, power, or combined test. Configure the desired test duration and workload settings, then start the test.
During testing, monitor temperatures, voltages, fan speeds, and other sensor readings. Stop the test if temperatures or other conditions become unsafe for your hardware. After completion, review the generated results and check for detected errors.
Because stress tests can place a heavy load on hardware, make sure the s
