Can You Use a PSU from One PC to Power the GPU in Another PC?

Yes, you can use a power supply unit (PSU) from one PC to power a GPU in another PC, but there are several important considerations to keep in mind. This article will guide you through the necessary steps to safely and effectively make this setup work, ensuring compatibility, voltage and amperage requirements, and safety precautions.

Compatibility

First and foremost, ensure that the PSU has the necessary power connectors that your GPU requires. Most modern GPUs demand either one or more 6-pin or 8-pin PCIe power connectors. It's crucial to check that the PSU can meet these specific needs to prevent system instability or damage.

Voltage and Amperage

Secondly, check that the PSU can provide the correct voltage and sufficient wattage for the GPU. Each GPU has its own power requirements, which are typically detailed in the GPU's specifications. Ensuring that the PSU can meet these requirements without strain is critical to the smooth operation of your setup.

Connection Method

If you're planning to use the PSU externally or in a non-standard manner, you'll need to ensure that you can connect it to the GPU safely without causing any short circuits. This may involve additional connectors or modifications. If necessary, consult a specialist or use a professional setup to minimize risks.

Powering the PSU

When the PSU is not connected to a motherboard, it won't turn on automatically. To turn it on, you need to short the green wire (PS_ON) to the black wire (COM) on the 24-pin connector. This process can be dangerous, so it's essential to follow safety protocols and ensure that all components are turned off and unplugged before connecting.

Safety

Always prioritize safety when working with electrical components. Ensure that all components are turned off and unplugged before making any connections. Additionally, be cautious about accidentally creating a short circuit or overloading the PSU. If you're not comfortable with these steps, it's best to seek the assistance of a professional.

Best Practices

While technically possible, using a PSU from one PC to power a GPU in another PC can be tricky and risky. Here are a few key points to keep in mind:

Always start both PSUs at the same time with no delay. This ensures that both systems are powered simultaneously and reduces the risk of issues. Ensure the PSU never shuts down during GPU use. The PSU should stay on continuously to maintain consistent power delivery. Calculate the required power for the first PC and ensure the GPU is allocated at least 200W. This helps prevent overloading and potential damage to the system.

Even with these precautions, there is still a risk of hardware damage or failure. We recommend using a dedicated, well-maintained PSU for each PC to minimize these risks. In practice, a mismatched PSU can lead to smoke and hardware damage, so it's best to avoid this setup entirely.

Finding the right balance between cost savings and system stability is crucial. If you're unsure about your setup, it's always best to consult a professional or invest in a compatible and efficient PSU for each PC.