1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your FSP Dagger Pro 850W SFX Power Supply. The FSP Dagger Pro series is designed for small form factor (SFX) systems, offering high efficiency and reliable power delivery for demanding components.
Key features of the FSP Dagger Pro 850W SFX Power Supply include:
- ATX 3.1 / PCIe 5.1 Compliance: Equipped with a native 12VHPWR connector and cable, supporting the latest generation hardware power demands.
- Fully Modular Design: Allows for connecting only necessary cables, improving airflow and reducing cable clutter within compact PC builds.
- Compact SFX Form Factor: Compatible with most Mini-ITX and Micro ATX cases, ideal for small form factor PCs.
- 80 PLUS Gold Certified Efficiency: Achieves over 90% efficiency at typical loads, contributing to lower power consumption, reduced heat output, and quieter operation.
- Single +12V Rail Design: Provides full power to VGA cards individually, preventing overloading conditions.
Image 1.1: FSP Dagger Pro 850W SFX Power Supply, showcasing its compact design and modular cable interface.
2. Safety Information
WARNING: Improper installation or use can result in serious injury or damage to equipment. Please read and follow all instructions carefully.
- Always disconnect the power cord from the wall outlet before installing, removing, or cleaning the power supply.
- Do not open the power supply unit. High voltages are present inside, and there are no user-serviceable parts. Opening the unit will void the warranty.
- Ensure the power supply is installed in a well-ventilated area. Do not block any ventilation openings.
- Use only the modular cables provided with this power supply. Using third-party cables may cause damage to the PSU or connected components.
- This product is designed for use in computer systems. Do not use it for any other purpose.
- Keep the power supply away from water, moisture, and extreme temperatures.
3. Package Contents
Verify that your package contains the following items:
- FSP Dagger Pro 850W SFX Power Supply Unit
- Modular Cable Set (including 12VHPWR, Motherboard 24-pin, CPU 8-pin, PCIe 6+2-pin, SATA, Peripheral)
- AC Power Cord
- Mounting Screws
- User Manual (this document)
Image 3.1: Illustration of the compact dimensions of the Dagger Pro PSU and the included modular cable set.
4. Setup and Installation
Follow these steps to install your FSP Dagger Pro 850W SFX Power Supply into your computer system.
4.1. Physical Installation
- Prepare your system: Ensure your computer is powered off and the power cord is disconnected from the wall outlet. Open your computer case to access the power supply mounting area.
- Remove old PSU (if applicable): If replacing an existing power supply, disconnect all cables from components and remove the old PSU from the case.
- Mount the new PSU: Carefully place the FSP Dagger Pro 850W into the SFX power supply bay of your case. Secure it using the provided mounting screws. Ensure the fan is oriented correctly for optimal airflow, typically facing inwards or downwards depending on case design.
Image 4.1: The FSP Dagger Pro PSU mounted in a system, highlighting the rear power switch and AC input.
4.2. Cable Connections
The Dagger Pro 850W is a fully modular power supply. Connect only the cables required for your system components.
Image 4.2: Detailed view of the modular cable connection panel on the PSU.
- Motherboard Power (24-pin): Connect the 24-pin ATX cable from the PSU to the corresponding port on your motherboard. Ensure it clicks into place.
- CPU Power (4+4-pin or 8-pin): Connect the CPU power cable(s) from the PSU to the CPU power connector(s) on your motherboard. High-end motherboards may require two 8-pin connectors.
- PCIe Power (6+2-pin or 12VHPWR):
- For graphics cards requiring 6-pin or 8-pin PCIe connectors, use the provided 6+2-pin cables.
- For NVIDIA RTX 40 series graphics cards or other GPUs requiring the new 12VHPWR connector, use the dedicated 12VHPWR cable. Ensure it is fully seated into both the PSU and the graphics card.
Image 4.3: The 12VHPWR connector on the Dagger Pro PSU, designed for modern high-power graphics cards.
- SATA Power: Connect SATA power cables to your SSDs, HDDs, and optical drives.
- Peripheral Power (Molex): Connect peripheral power cables for case fans, fan controllers, or other accessories that use Molex connectors.
- Cable Management: Route cables neatly to improve airflow and aesthetics within your case.
5. Operating Instructions
Once all components are connected and secured, you can power on your system.
- Connect AC Power: Plug the AC power cord into the power supply's inlet and then into a wall outlet or surge protector.
- Power On PSU: Flip the power switch on the back of the power supply to the "ON" (I) position.
- Power On System: Press the power button on your computer case.
5.1. Fan Operation (Semi-Fanless Mode)
The FSP Dagger Pro 850W features a semi-fanless design for optimized low-noise operation. The fan will remain off (0dBA) under low load conditions (typically below 20% load or <25°C internal temperature). As the load increases, the fan will gradually spin up to maintain optimal temperatures, ensuring quiet operation when not under heavy demand.
Image 5.1: Fan operation curve illustrating the semi-fanless mode for reduced noise at low loads.
6. Maintenance
Proper maintenance ensures the longevity and optimal performance of your power supply.
- Cleaning: Periodically clean the exterior of the power supply and its fan grill to prevent dust buildup. Use compressed air to gently clear dust from the fan and vents. Always disconnect the power cord before cleaning.
- Airflow: Ensure that the power supply's intake and exhaust vents are not obstructed. Maintain good airflow within your computer case to prevent overheating.
- Cable Inspection: Occasionally check all cable connections to ensure they are secure and free from damage.
7. Troubleshooting
If you encounter issues with your FSP Dagger Pro 850W power supply, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| System does not power on. |
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| System powers on but shuts down immediately. |
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| Fan is not spinning. |
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If the problem persists after trying these solutions, please contact FSP customer support.
8. Specifications
Detailed specifications for the FSP Dagger Pro 850W SFX Power Supply (SDA2-850-G5):
| Feature | Detail |
|---|---|
| Model Name | SFX PSU |
| Item Model Number | SDA2-850-G5 |
| Form Factor | SFX |
| Output Wattage | 850 Watts |
| 80 PLUS Certification | Gold |
| ATX Standard | ATX 3.1 |
| PCIe Standard | PCIe 5.1 (with native 12VHPWR) |
| Modularity | Full Modular |
| Cooling Method | Air (92mm fan, semi-fanless) |
| Product Dimensions (L x W x H) | 5 x 4 x 2.5 inches (125 x 100 x 63.5 mm) |
| Item Weight | 4.51 pounds (2.05 Kilograms) |
| Compatible Devices | Computer, PC |
| Manufacturer | FSP Group U.S.A |
Image 8.1: Explanation of the single +12V rail design for stable power to VGA cards.
9. Warranty and Support
The FSP Dagger Pro 850W SFX Power Supply comes with a 10-year manufacturer's warranty, ensuring long-term reliability and peace of mind. This warranty covers defects in materials and workmanship under normal use.
For technical support, warranty claims, or further assistance, please visit the official FSP website or contact their customer service department. Keep your proof of purchase for warranty validation.
FSP Official Website: https://www.fsplifestyle.com/
