How to Daisy Chain Two PSUs: A Comprehensive Guide

The world of PC building can be daunting, especially when it comes to power supply units (PSUs). While a single PSU is typically sufficient, demanding builds often require more juice than one can provide. This is where daisy chaining comes in. In this article, we’ll delve into the art of daisy chaining two PSUs, focusing on the technique known as “daisy chaining,” which allows you to combine the power of two PSUs to power your high-end PC components.

What is Daisy Chaining?

Daisy chaining is a technique where you connect two PSUs together to create a single, more powerful power source for your PC. This is achieved by connecting the output of one PSU to the input of another. The term “daisy chain” comes from the visual representation of the setup, where the connections resemble a chain of flowers linked together.

Why Daisy Chain PSUs?

Daisy chaining PSUs presents several advantages:

  • Increased Power Output: Combining the power of two PSUs significantly boosts the overall power output available to your PC. This is crucial for high-end builds with multiple GPUs, powerful CPUs, and other power-hungry components.
  • Redundancy: In the event of one PSU failing, the other can still provide power, minimizing downtime and data loss. This is especially important for critical systems like servers.
  • Flexibility: Daisy chaining offers flexibility in how you distribute power. You can connect specific components to different PSUs, optimizing power flow and reducing strain on individual units.

Understanding the Daisy Chain Configuration

Daisy chaining PSUs is not a straightforward plug-and-play process. It requires careful planning and adherence to specific configurations to ensure safety and optimal performance. Here’s a breakdown of the essential components involved:

  • Two PSUs: You need two PSUs with compatible specifications. Ensure that the combined output of the PSUs meets the power requirements of your PC build.
  • Daisy Chain Adapter: This specialized adapter connects the output of one PSU to the input of the other. It facilitates the power transfer between the units, ensuring proper signal flow.
  • Power Distribution Board: A power distribution board acts as a central hub for connecting your components to the daisy-chained PSUs. It simplifies cable management and ensures a clean power delivery system.

Choosing the Right PSUs

Selecting the right PSUs for daisy chaining is crucial for a successful and safe setup. Consider these factors:

  • Compatibility: Ensure both PSUs are compatible with each other. Check for matching voltage ratings and connector types.
  • Power Output: The combined power output of both PSUs must meet the total power demand of your PC build. Leave a margin for future upgrades or overclocking.
  • Efficiency: Opt for PSUs with high efficiency ratings (80 Plus or better) to minimize power loss and heat generation.
  • Reliability: Choose reputable brands with a proven track record of reliability.

Implementing the Daisy Chain Configuration

Once you have the necessary components, it’s time to implement the daisy chain configuration:

1. Connect the First PSU to the Power Distribution Board: Connect the first PSU directly to the power distribution board using its main power cable.

2. Connect the Daisy Chain Adapter: Connect the output of the first PSU to the input of the daisy chain adapter.

3. Connect the Second PSU to the Daisy Chain Adapter: Connect the second PSU’s input to the daisy chain adapter’s output.

4. Connect the Second PSU to the Power Distribution Board: Connect the second PSU’s main power cable to the power distribution board.

5. Connect Components to the Power Distribution Board: Use individual power cables to connect your PC components (motherboard, GPU, drives, etc.) to the power distribution board.

6. Power On: Ensure all connections are secure, then turn on both PSUs. You should see the power distribution board light up, indicating that the daisy-chained system is operational.

Safety Precautions and Considerations

Daisy chaining PSUs is a powerful technique, but it requires careful attention to safety:

  • Proper Wiring: Ensure all connections are secure and free from any loose wires or shorts.
  • Cable Management: Keep cables organized and out of the way to prevent tripping hazards and improve airflow.
  • Overload Protection: Avoid overloading individual PSUs beyond their rated capacity. Divide components evenly across the two PSUs to maintain a balanced load.
  • Heat Dissipation: Ensure adequate ventilation around the PSUs and power distribution board to prevent overheating.
  • Professional Assistance: If you are unsure about any aspect of the daisy chaining process, consult a qualified technician.

Advantages of Daisy Chaining

  • Increased Power Output: Daisy chaining allows you to combine the power output of two PSUs, providing ample power for high-end PC components.
  • Redundancy: If one PSU fails, the other can continue to power your system, minimizing downtime.
  • Flexibility: Daisy chaining offers flexibility in power distribution, allowing you to connect specific components to different PSUs.
  • Performance Enhancement: Proper daisy chaining can improve system stability and performance by minimizing power limitations.

Disadvantages of Daisy Chaining

  • Complexity: Daisy chaining requires careful planning and configuration, which can be challenging for beginners.
  • Cost: Purchasing two PSUs and a daisy chain adapter can be more expensive than using a single high-power PSU.
  • Compatibility Issues: Ensuring compatibility between PSUs and adapters is essential.
  • Safety Concerns: If not implemented correctly, daisy chaining can lead to safety hazards, such as overloading or overheating.

Alternatives to Daisy Chaining

While daisy chaining offers a solution for high-power needs, alternatives exist:

  • High-Power Single PSU: A single PSU with sufficient wattage can eliminate the need for daisy chaining.
  • Modular PSUs: Modular PSUs offer flexible cable management and can accommodate specific component power requirements without daisy chaining.
  • Multiple Power Supplies: Instead of daisy chaining, you can use multiple PSUs independently to power separate components.


Daisy chaining two PSUs can be a valuable technique for boosting power output, ensuring redundancy, and providing flexibility for high-end PC builds. However, it requires careful planning, proper implementation, and strict adherence to safety precautions. Before attempting this technique, consider your PC’s power requirements, the compatibility of your PSUs, and potential safety risks. Always prioritize safety and consult a qualified technician if you have any doubts.

Frequently Asked Questions

1. What is Daisy Chaining?

Daisy chaining is a technique used to connect multiple power supply units (PSUs) in a series. Essentially, you connect the output of one PSU to the input of the next PSU, creating a chain of power sources. This allows you to increase the total wattage available to your system, making it ideal for high-powered components like multiple graphics cards or overclocked CPUs.

While daisy chaining can provide more power, it is important to consider the potential risks. This method is not as efficient as using a single high-wattage PSU, and can lead to voltage inconsistencies and instability, especially if the PSUs are not matched in terms of their specifications.

2. Why Should I Daisy Chain PSUs?

Daisy chaining is a practical solution when you need more power than a single PSU can provide, but you lack the space or budget for a higher-wattage alternative. This approach is particularly useful for systems with multiple graphics cards, overclocked CPUs, or other power-hungry components.

However, it is important to remember that daisy chaining is not the ideal solution and should only be considered as a last resort. It is generally recommended to invest in a single high-wattage PSU for optimal performance and stability.

3. Is Daisy Chaining PSUs Safe?

Daisy chaining can be safe if done correctly, but it comes with inherent risks. The key is to use compatible PSUs with matching voltage rails and current ratings. It is also crucial to ensure that the PSUs are properly connected and that the wiring is secure.

However, it is important to note that daisy chaining can introduce voltage fluctuations and potential instability issues, especially if the PSUs are not properly matched or if the system draws high power. It is always recommended to monitor your system closely and take appropriate precautions to mitigate risks.

4. How Do I Connect Two PSUs in a Daisy Chain?

Connecting two PSUs in a daisy chain involves connecting the output of one PSU to the input of the next PSU. You will need a special cable, usually referred to as a “daisy chain cable,” which has multiple connectors on one end and a single connector on the other.

The daisy chain cable will typically have multiple PCIe power connectors on one end, and a single 24-pin motherboard connector on the other. You will connect the PCIe connectors to your graphics cards and the 24-pin connector to your motherboard.

5. What Are the Risks of Daisy Chaining PSUs?

While daisy chaining can provide additional power, it is not without its risks. One major concern is voltage fluctuations and instability, especially if the PSUs are not properly matched. Another risk is that the system may draw more power than the individual PSUs can provide, leading to overheating or even damage to components.

It is essential to carefully consider the potential risks before opting for daisy chaining and to prioritize safety measures throughout the process.

6. How Can I Ensure My System Is Stable When Daisy Chaining PSUs?

To ensure stability when daisy chaining PSUs, it is crucial to choose compatible units with matching voltage rails and current ratings. It is also vital to ensure that the PSUs are properly connected, the wiring is secure, and the system is adequately ventilated to prevent overheating.

It is a good practice to test your system thoroughly after daisy chaining the PSUs. Monitor the temperature of your components, and watch for any signs of instability or voltage fluctuations.

7. Are There Alternatives to Daisy Chaining PSUs?

Yes, there are alternatives to daisy chaining PSUs. The most common and generally recommended solution is to invest in a single high-wattage PSU that can handle the power demands of your system.

If you lack the budget for a single high-wattage PSU, consider upgrading your existing PSU instead of daisy chaining. Upgrading your PSU will offer better efficiency, stability, and overall performance compared to daisy chaining.

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