1. Rhagymadrodd
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.
- Dyluniad Modiwlaidd Llawn: 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. Gwybodaeth Diogelwch
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.
- Peidiwch ag agor yr uned cyflenwad pŵer. Cyfaint ucheltages 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. Cynnwys Pecyn
Gwiriwch fod eich pecyn yn cynnwys yr eitemau canlynol:
- 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)
- Cord pŵer AC
- Sgriwiau Mowntio
- Llawlyfr Defnyddiwr (y ddogfen hon)

Image 3.1: Illustration of the compact dimensions of the Dagger Pro PSU and the included modular cable set.
4. Gosod a Gosod
Follow these steps to install your FSP Dagger Pro 850W SFX Power Supply into your computer system.
4.1. Gosod Corfforol
- Paratowch eich 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. Cysylltiadau Cebl
The Dagger Pro 850W is a fully modular power supply. Connect only the cables required for your system components.

Delwedd 4.2: Manwl 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.
- Pwer SATA: 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.
- Rheoli Ceblau: Llwybrwch geblau'n daclus i wella llif aer ac estheteg yn eich cas.
5. Cyfarwyddiadau Gweithredu
Once all components are connected and secured, you can power on your system.
- Cysylltwch 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.
- System Pŵer Ymlaen: Pwyswch y botwm pŵer ar gas eich cyfrifiadur.
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. cynnal
Mae cynnal a chadw priodol yn sicrhau hirhoedledd a pherfformiad gorau posibl eich cyflenwad pŵer.
- Glanhau: 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.
- Llif aer: Ensure that the power supply's intake and exhaust vents are not obstructed. Maintain good airflow within your computer case to prevent overheating.
- Archwiliad cebl: Gwiriwch yr holl gysylltiadau cebl o bryd i'w gilydd i sicrhau eu bod yn ddiogel ac yn rhydd o ddifrod.
7. Datrys Problemau
If you encounter issues with your FSP Dagger Pro 850W power supply, refer to the following common problems and solutions:
| Problem | Achos Posibl | Ateb |
|---|---|---|
| Nid yw'r system yn pweru ymlaen. |
|
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| Mae'r system yn troi ymlaen ond yn cau i lawr ar unwaith. |
|
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| Nid yw ffan yn nyddu. |
|
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If the problem persists after trying these solutions, please contact FSP customer support.
8. manylebau
Detailed specifications for the FSP Dagger Pro 850W SFX Power Supply (SDA2-850-G5):
| Nodwedd | Manylyn |
|---|---|
| Enw Model | SFX PSU |
| Rhif Model yr Eitem | SDA2-850-G5 |
| Ffactor Ffurf | SFX |
| Allbwn Wattage | 850 Wat |
| Ardystiad 80 PLUS | Aur |
| Safon ATX | ATX 3.1 |
| Safon PCIe | PCIe 5.1 (with native 12VHPWR) |
| Modiwlaidd | Modiwlar Llawn |
| Dull Oeri | Air (92mm fan, semi-fanless) |
| Dimensiynau Cynnyrch (L x W x H) | 5 x 4 x 2.5 modfedd (125 x 100 x 63.5 mm) |
| Pwysau Eitem | 4.51 pwys (2.05 cilogram) |
| Dyfeisiau Cydnaws | Cyfrifiadur, PC |
| Gwneuthurwr | FSP Group U.S.A |

Image 8.1: Explanation of the single +12V rail design for stable power to VGA cards.
9. Gwarant a Chefnogaeth
The FSP Dagger Pro 850W SFX Power Supply comes with a Gwarant gwneuthurwr 10 flynedd, gan sicrhau dibynadwyedd hirdymor a thawelwch meddwl. Mae'r warant hon yn cwmpasu diffygion mewn deunyddiau a chrefftwaith o dan ddefnydd arferol.
For technical support, warranty claims, or further assistance, please visit the official FSP websafle neu cysylltwch â'u hadran gwasanaeth cwsmeriaid. Cadwch eich prawf prynu i ddilysu'r warant.
FSP Official Websafle: https://www.fsplifestyle.com/





