How To Connect Multiple GPUs to PSU?

There are a lot of times when you want to connect more than one graphics card to your power supply, but you need to figure out how this works or what you need to do. In this post, we will go over the basics for connecting multiple graphics cards to your PSU.

How to Connect Multiple GPUs to PSU

This guide will explain how to connect multiple GPUs to a power supply unit (PSU). This is useful if you want to run multiple graphics cards simultaneously.

Before getting started, ensure that your PSU has enough wattage and capacity for the number of GPUs you are connecting. Additionally, ensure that each GPU has a power cable long enough to reach the PSU. 

To connect the GPUs, unplug the old power cable from the PSU and plug in the new one. Then, connect each GPU’s power cable to the corresponding connector on the PSU. Lastly, plug in the PSU and turn it on. 

Depending on your graphics card(s), you may need to adjust settings in your operating system or software driver to allow multiple graphics cards to work simultaneously.

How to Connect Multiple GPUs on A Single PSU

GPUs are great for gaming and graphics-intensive tasks but can also be used in other applications, such as rendering or machine learning. To keep your system running smoothly, you need to connect them to a power supply.

When connecting multiple GPUs to a PSU, ensure the voltage is correct. Most modern PSUs have a range of voltages that they can deliver to the GPUs, so be sure to check the specs before you buy.

Some PSUs have enough wattage for multiple GPUs, while others might need help to provide the necessary voltage.

If your PSU doesn’t have enough wattage for your cards, you can use an adapter or extension cable. An adapter plugs into one end of the PSU and has a larger plug on the other that fits into the card.

An extension cable is a single cable with both ends fitted with plugs so it can reach from one end of the computer to another.

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Why Use Multiple GPUs?

GPUs are a powerful addition to your computer system and can accelerate the rendering of 3D graphics, videos, and other tasks. When using multiple GPUs, it is important to ensure that the power supply unit (PSU) can supply the necessary wattage and voltage.

If you use two or more GPUs, you will need a PSU that can provide at least 600 watts of continuous power. This is because each GPU requires its voltage and wattage.

You should also ensure that the PSU has enough connectors to connect your GPUs. Some PSUs have four-pin connector slots, while others have six-pin connectors. It is also important to note that some GPUs require a separate power cable while others do not.

The Limits to Multiple GPUs

GPUs are powerful hardware that can be used for different tasks in computing. However, there are some limitations to consider when using multiple GPUs.

One limitation is the power supply. Multiple GPUs require more power than a single card and, as such, require a powerful PSU. If you’re using a laptop or desktop with a single PSU, you’ll likely run into issues if you try to install multiple GPUs.

In particular, if your laptop or desktop only has one PCIe slot, installing two cards will likely require purchasing an extra PCIe card and upgrading the PSU.

Another limitation is heat production. Multiple GPUs produce more heat than a single card, which can become an issue if your laptop or desktop doesn’t have adequate cooling.

If your laptop or desktop is already running hot and you add another card, it will only worsen matters. In addition, if your GPU(s) are running too hot, they may not operate at their best and may even fail prematurely.

Finally, another limitation is bandwidth. Multiple GPUs require more bandwidth than a single card to communicate with each other and any additional devices on your motherboard (like the RAM).

This can lead to issues if your computer needs more bandwidth or if you’re trying to use multiple monitors simultaneously.

Connecting Multiple GPUs to PSU

If you have more than one graphics card you want to connect to your power supply, there are a few things to remember. First, make sure your PSU has at least one 6-pin connector for each graphics card you want to use. Second, make sure you have the correct cables.

Third, make sure the cables are long enough. Fourth, ensure the connectors on the graphics cards are properly seated in the ports on the PSU. Fifth, turn off any unnecessary devices in your system before connecting the graphics cards.

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Sixth, power on your system and connect each graphics card to its corresponding power supply. Seventh, start up your game or application and check that all graphics cards are working properly.

Eighth, if everything is working as it should be, disconnect any unused graphics cards from their power supplies and store them away until the next time you need them.

How many GPUs can you connect to a PSU?

A power supply can provide up to eight GPUs with sufficient power, but be aware that some cards require more than others. The amount of power a card needs will depend on its graphics processor and the connector type.

Some connectors use six-pin connectors, while other use four-pin connectors. Four-pin connectors are typically found on older cards and require more power than six-pin connectors. Ensure you buy a PSU with the correct connector type for your GPUs.

Another factor to consider is how many monitors you want to connect to the GPU. Most GPUs can only output video to one display simultaneously, so if you want to connect two monitors simultaneously, you will need two separate PSUs.

Which PSUs have multiple GPU connectors?

There are a few different types of PSUs that have multiple GPU connectors. The first type is the modular PSU, which comprises many small cables that can be plugged into each other. This makes it easier to move the GPUs around and more efficient because it uses less electricity to power the GPUs.

The second type of PSU is the hybrid PSU. This PSU combines the modularity of the PSUs with the multiple GPU connectors of the ATX form factor.

Hybrid PSUs are usually larger than modular PSUs and have many cables running through them. However, they’re still relatively easy to move around because a central hub connects them.

The final type of PSU is the multi-outlet PSU. This special EPS12V power supply has several slots to plug in your graphics cards.

This allows you to use more than one graphics card at once, which can be useful if you want to play games on multiple monitors or if you want to use two graphics cards for SLI action gaming.

  1. Tips and Considerations
  2. If you plan to use multiple GPUs, it is important to ensure that the PSU can handle the extra load. Many PSUs only have one or two PCIe inputs, so if you have three or more GPUs, you’ll need to purchase a PSU with more than one input.
  3. Ensure that your GPUs are properly installed and connected to the PSU before powering on your system. Improperly connected hardware can cause damage to both the GPU and PSU.
  4. When using multiple GPUs, optimizing your system settings for each card is important. Each card requires different amounts of memory and graphic resources to function at its best.
  5. Lastly, be aware that overclocking can cause damage to your graphics hardware and PSU. Overclocking can also increase your power consumption, so consider how much power your PSU can provide when overclocking your graphics cards.
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Frequently Asked Questions

What are the requirements for connecting multiple GPUs to a PSU?

To connect multiple GPUs to a PSU, you’ll need two 6-pin PCI-E connectors and an 8-pin PCI-E connector. Additionally, each GPU will require its power connection. Some motherboards may include multiple power connections, while others may require you to purchase a separate power supply. Be sure to check your PSU’s documentation before connecting your GPUs!

Won’t connect multiple GPUs cause them to overheat?

No guarantee connecting multiple GPUs will cause them to overheat, but it’s generally not a good idea to do so. Overheating can lead to decreased performance and potential damage to your hardware. If you decide to connect your GPUs, follow all manufacturer guidelines and ensure that your PSU can handle the extra load!

How do I know which PCIe slot on my motherboard is for which GPU?

Some motherboards have markings on their PCIe slots that indicate which GPU each slot is intended for. You can also find this information in the motherboard’s documentation or online. In some cases, you may also be able to fit more than one GPU into a given PCIe slot on your motherboard (as long as they use the same connector type). Be sure to check before buying your graphics cards!


If you’re looking to build a powerful gaming rig or upgrade your current setup, you’ll need to connect multiple GPUs to your PSU.

This article has outlined the basics of connecting GPUs to a PSU and provided some helpful tips. So, whether upgrading an old PC or building a brand new one, read through this guide first!

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Matt Wilson
By Matt Wilson

Matt Wilson is a PC gaming and hardware expert with years of experience. He's a trusted tech product reviewer for gamers and tech enthusiasts.

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