CPU test: performance and overheating
Score single-core and multi-core CPU performance and run a 20-second heavy load to catch overheating and throttling from dried thermal paste, dusty fans or a weak battery.
✓ Pass if
- Performance drops less than 25%
- The device getting warm is normal
✗ Fail if
- Performance drops more than 25%
- Device gets too hot to hold, fan rattles
Next test: WiFi and network speed test ›
Other tests
- Check device specs
- Dead pixel, backlight bleed and burn-in test
- Screen refresh rate test (Hz)
- Touch screen test: dead zones and ghost touches
- Multi-touch test
- Speaker test: left, right, distortion
- Microphone test: record and play back
- Front camera, rear camera and flash test
- Laptop keyboard test
- Touchpad and mouse test
- Sensor and vibration test
- Fingerprint and Face ID test
- Battery and charging port test
- WiFi and network speed test
- GPS and location test
- Manual used-device checklist