Guides & Troubleshooting

Getting Started with OCCT

Follow these steps to install and launch OCCT for your first stability test session.

1. 1
   Download and verify. Download OCCT from the official download page. Verify the SHA-256 checksum matches the published hash before running the installer.
2. 2
   Install with administrator privileges. Run the installer as administrator to ensure full sensor access for monitoring features. Check the digital signature in file properties before proceeding.
3. 3
   Close unnecessary applications. Close background apps, browsers and games before stress testing to ensure accurate results and prevent interference with test workloads.
4. 4
   Select your test type. Choose CPU, GPU, Memory or Power test from the main interface. Configure duration and monitoring sensors before starting.
5. 5
   Monitor and review. Watch real-time temperature and voltage graphs during the test. Review the generated report for errors, throttling or instability indicators when complete.

CPU Stress Testing Guide

CPU testing validates processor stability under maximum load. Essential for overclocking validation and pre-delivery QA on custom builds.

Memory Test Configuration

The v17 memory test overhaul introduces presets, import/save functionality and a block system for granular memory validation. Follow each step below with the matching OCCT interface view.

Click any screenshot to open it full size.

Step 01

Select a preset or create custom

Open the Memory test, switch to the Presets tab and pick a profile such as OCCT Showcase or Extreme Anta777. Adjust memory coverage and thread count before running.

OCCT — Memory Configuration Presets

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Step 02

Configure the block system

On the Custom tab, build your test sequence with Loop Start, TM5 Arithmetic, Double Flip and Check blocks. Set cycle counts and fine-tune each step for deep RAM coverage.

OCCT — Test Sequence Blocks

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Step 03

Save and import profiles

Use the save and load icons above the test sequence to export your configuration or import a preset from another machine. Ideal for build shops and fleet burn-in workflows.

OCCT — Preset Management Import

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04

Verify XMP / EXPO profiles

Run a memory test before and after enabling XMP or EXPO in BIOS. Compare OCCT reports to confirm your RAM is stable at the rated speed and timings.

Monitoring Setup

OCCT integrates the Hwinfo engine for accurate sensor readouts. Proper monitoring setup ensures you catch thermal and electrical issues during stress tests.

GPU and 3D Testing Guide

OCCT's 3D adaptive testing dynamically adjusts GPU load to replicate real gaming conditions. Use this for GPU overclock validation and artifact detection.

1. 1. Select 3D test mode and choose adaptive testing for realistic load patterns
2. 2. Enable GPU temperature, hotspot, memory junction and power sensors
3. 3. Run for at least 30 minutes to detect thermal throttling under sustained load
4. 4. For multi-GPU setups, use parallel testing to validate all cards simultaneously
5. 5. For AI/compute cards without 3D support, switch to GPU Compute (OpenCL) mode

Understanding Test Reports

OCCT generates detailed reports after every test session. Learn to read them effectively and use report comparison for rapid diagnostics.

Custom Test Setup

Build repeatable test suites for production environments, PC building shops and automated QA workflows.

• Save presets: Configure your ideal test parameters and save them as named presets for one-click execution on every new system.
• Test sequences: Run CPU, then GPU, then memory tests in sequence for comprehensive validation before customer delivery.
• Automated certificates: Generate stability certificates automatically after successful test completion for professional documentation.
• Linux automation: Deploy identical test configurations across server fleets using saved presets and command-line execution on Linux builds.

Common Problems and Solutions

OCCT Testing Best Practices