1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Gigabyte AP850GM 850W ATX Power Supply. Please read this manual thoroughly before installation and keep it for future reference. This power supply unit (PSU) is designed to provide stable and reliable power to your personal computer system.
2. Safety Information
WARNING: Improper installation or use can lead to equipment damage, electric shock, or serious injury. Always follow these safety guidelines:
- Ensure the power supply is disconnected from the AC power outlet before installation or handling.
- Do not open the power supply casing. High voltages are present inside, even when disconnected. There are no user-serviceable parts.
- Install the power supply in a well-ventilated area, away from heat sources, direct sunlight, and moisture.
- Use only the modular cables provided with this power supply. Using third-party cables may cause damage to the PSU or connected components.
- Ensure all cables are securely connected. Loose connections can cause overheating or system instability.
- This product is designed for indoor use only.
- Do not block any ventilation openings of the power supply.
3. Package Contents
Verify that all items are present in your package:
- Gigabyte AP850GM Power Supply Unit
- Modular Cable Set (PCI-E, SATA, Peripheral, CPU, ATX 24-pin)
- AC Power Cord
- Mounting Screws
- User Manual (this document)

Figure 1: Gigabyte AP850GM Power Supply and its retail packaging. The image shows the black power supply unit next to its orange and black box, highlighting the AORUS branding and 80 PLUS GOLD certification.
4. Product Features
- Model: GP-AP850GM
- Output Power: 850 Watts
- Efficiency: 80 PLUS GOLD certified, ensuring high energy efficiency.
- PFC: Active Power Factor Correction (PFC) for stable power delivery.
- MTBF: 100,000 hours Mean Time Between Failures, indicating high reliability.
- Form Factor: ATX, compatible with most standard PC cases.
- Cooling: Air cooling with a smart fan for optimal thermal performance and quiet operation.
- Modular Design: Fully modular cable design for easier installation and improved airflow.

Figure 2: Top-down view of the Gigabyte AP850GM Power Supply, showcasing the fan grill with the AORUS logo at its center. The hexagonal mesh design ensures efficient airflow.
5. Setup and Installation
Follow these steps to install your Gigabyte AP850GM Power Supply:
- Prepare Your System: Ensure your computer is completely powered off and unplugged from the wall outlet. Open your computer case.
- Remove Old PSU (if applicable): Disconnect all cables from your old power supply. Unscrew and remove the old PSU from the case.
- Mount the New PSU: Carefully place the Gigabyte AP850GM into the PSU bay of your computer case. Ensure the fan is facing the correct direction (usually downwards for bottom-mounted PSUs, or as per case design for optimal airflow). Secure the PSU with the provided mounting screws.
- Connect Essential Cables:
- Connect the 24-pin ATX motherboard power cable.
- Connect the 4+4-pin or 8-pin CPU power cable to your motherboard.
- Connect the necessary PCI-E power cables (6+2-pin) to your graphics card(s).
- Connect SATA power cables to your storage drives (HDDs, SSDs) and optical drives.
- Connect peripheral (Molex) cables to any other components requiring them (e.g., case fans, fan controllers).
Note: Only connect the cables you need to reduce clutter and improve airflow.
- Cable Management: Route cables neatly behind the motherboard tray or in designated cable management areas of your case to ensure good airflow.
- Close Case and Power On: Close your computer case. Connect the AC power cord to the PSU and then to a wall outlet. Flip the power switch on the PSU to the 'ON' position. Power on your computer.

Figure 3: Angled view of the Gigabyte AP850GM Power Supply, showing its modular cable ports and the AORUS branding on the side. The unit features a black finish with grey and orange accents.
6. Operating Instructions
The Gigabyte AP850GM Power Supply operates automatically once installed and connected correctly. Here are some general operating guidelines:
- Power Switch: The main power switch on the back of the PSU controls the power flow to the unit. Ensure it is in the 'ON' position for your computer to receive power.
- Fan Operation: The integrated fan will operate to cool the PSU components. The fan speed is automatically adjusted based on the PSU's temperature and load to maintain optimal cooling and minimize noise.
- System Shutdown: Always shut down your computer through the operating system. Avoid simply flipping the PSU's main power switch off while the system is running, as this can lead to data loss or component damage.

Figure 4: Another angled perspective of the Gigabyte AP850GM Power Supply, highlighting its compact design and the textured finish of the casing. The AORUS logo is visible on the side panel.
7. Maintenance
To ensure the longevity and optimal performance of your Gigabyte AP850GM Power Supply, consider the following maintenance tips:
- Dust Removal: Periodically clean dust from the PSU's fan grill and ventilation openings using compressed air. Ensure the computer is powered off and unplugged before cleaning.
- Environment: Operate the PSU in a clean, dry, and well-ventilated environment. Avoid extreme temperatures and humidity.
- Cable Integrity: Regularly check that all modular cables are securely connected and free from damage.
8. Troubleshooting
If you encounter issues with your Gigabyte AP850GM Power Supply, refer to the following common troubleshooting steps:
- No Power:
- Ensure the AC power cord is securely plugged into both the PSU and the wall outlet.
- Check that the PSU's main power switch is in the 'ON' position.
- Verify that the wall outlet is functional by plugging in another device.
- Confirm all internal power cables (24-pin ATX, CPU, GPU) are correctly and firmly seated.
- System Instability/Crashes:
- Ensure the PSU is adequately rated for your system's components. The AP850GM provides 850W, which is sufficient for most high-performance systems.
- Check for loose cable connections.
- Monitor system temperatures to ensure components are not overheating, which can sometimes be mistaken for PSU issues.
- Loud Fan Noise:
- Clean any dust accumulation from the PSU fan and vents using compressed air.
- Ensure the PSU is not operating in an excessively hot environment.
- If the noise is unusual (grinding, rattling), contact Gigabyte support.
If these steps do not resolve your issue, consult the Gigabyte support website or contact their customer service.
9. Specifications
| Feature | Specification |
|---|---|
| Brand | Gigabyte |
| Model Name | AP850GM (GP-AP850GM) |
| Product Type | ATX Power Supply Unit |
| Output Power | 850 Watts |
| Efficiency | 80 PLUS GOLD Certified |
| PFC | Active PFC |
| MTBF | 100,000 hours |
| Form Factor | ATX |
| Cooling Method | Air (Smart Fan) |
| Compatible Devices | Personal Computer |
| Item Weight | 2 Kilograms |
10. Warranty and Support
For warranty information and technical support, please refer to the official Gigabyte website or contact their customer service department. Keep your proof of purchase for warranty claims.
Gigabyte Official Website: www.gigabyte.com







