What Power Supply Do I Need For 2 Graphics Cards?

Determining the power supply for a dual graphics card setup is essentialIt involves assessing the combined power needs of both graphics cards, the CPU, and other components to ensure stable performance. Selecting an adequate-wattage PSU with modular cables and high efficiency is crucial to meet the increased power demand and avoid potential issues. Careful consideration of the specific requirements, brand, and future upgrades is key in choosing the right power supply for your dual GPU configuration.

Curious about optimizing your PC’s performance with dual graphics cards? Discover the answer to the crucial question, What Power Supply Do I Need for 2 Graphics Cards? in our comprehensive guide. Don’t miss out on the chance to level up your computing experience.

Determining the appropriate power supply for a dual graphics card setup is vital for smooth and reliable performance. It involves calculating the combined power requirements of both GPUs, the CPU, and other components in your PC. Choosing a power supply unit (PSU) with sufficient wattage, modular cables for clean cable management, and high efficiency is essential to meet the increased power demands and avoid potential issues. 

Why use two graphics cards?

Before we delve into power supply considerations, let’s briefly explore why you might want to use two graphics cards in the first placeDual GPU setups are particularly appealing for:

  • Gaming: Enhanced gaming performance, higher frame rates, and the ability to run the latest titles with maximum graphics settings make Gigabyte Good For Gaming a compelling choice for gamers seeking a top-tier gaming experience.
  • Content Creation: Faster rendering times for video editing, 3D modeling, and other creative tasks.
  • Professional Applications: Improved performance in applications that can harness the power of multiple GPUs, such as scientific simulations and data processing.

Understanding Power Consumption

Adding a second graphics card significantly increases your PC’s power consumptionModern GPUs are power-hungry, and when you have two of them running simultaneously, you’ll need to ensure your PSU can meet the demand.The power consumption of a GPU is typically measured in watts (W), and it’s crucial to know the power requirements of your specific graphics cards.

Calculating Power Supply Requirements

To determine the power supply requirements for a dual GPU system, you’ll need to consider several factors:

Graphics Cards’ Power Consumption:

Research the power draw of each graphics card. This information can usually be found in the card’s specifications provided by the manufacturer.

CPU power consumption:

While GPUs play a vital role, don’t forget about your CPU’s power consumptionSome high-end CPUs can be power-hungry as well.

Additional Components

Account for the power needs of other components like motherboards, RAM, hard drives, SSDs, optical drives, and any additional peripherals.


If you plan to overclock your GPUs or CPUs, consider the increased power requirements.

Choosing the Right Power Supply

What Power Supply Do I Need For 2 Graphics Cards?

Once you have a clear understanding of your system’s power requirements, it’s time to select the right power supplyConsider the following factors:

Total Wattage

Ensure the PSU has enough total wattage to meet the combined power needs of your graphics cards, CPU, and other componentsA PSU with a higher wattage rating provides some headroom, which can be beneficial.

Efficiency Rating

Look for an 80 PLUS certified PSU, as it indicates energy efficiencyHigher-rated PSUs waste less power as heat and often come with better components.


Modular PSUs allow you to detach unused cables, keeping your system’s interior clean and improving airflow.

Ample Connectors

Make sure the PSU provides enough connectors for all your components, especially if you have multiple hard drives, SSDs, and peripherals.

Brand and quality:

Choose a reputable PSU manufacturer known for producing reliable and high-quality units. Saving money on a cheap PSU can lead to problems down the line.


Consider future upgradesIf you plan to add more components or upgrade to more power-hungry GPUs, it’s wise to select a PSU that can accommodate those changes.

Key Factors in Power Supply Selection

When selecting a power supply for a dual GPU setup, these factors are essential to keep in mind:

  • PCIe Connectors: Ensure that the PSU provides enough PCIe connectors for both graphics cardsCheck the GPU manufacturer’s requirements for this.
  • Rails and Amperage: Examine the number of +12V rails on the PSU and their amperageMake sure they can handle the combined load of your components.
  • Size and Form Factor: Ensure the PSU fits your PC case without issues.
  • Cooling and Noise: Consider the PSU’s cooling system and noise levelsSome high-wattage PSUs can generate considerable heat and noise, impacting your overall system’s comfort.
  • Modularity: If cable management is essential to you, opt for a modular PSUThis allows you to connect only the cables you need, reducing clutter and improving airflow.
  • Warranty: Check the warranty lengthA more extended warranty typically indicates the manufacturer’s confidence in their product.

Setting Up Your Dual GPU System

With the right power supply in hand, it’s time to set up your dual GPU systemFollow these steps for a smooth installation:

Turn off and unplug

Before any hardware installation, turn off your PC and unplug it from the power source.

Remove Existing GPU

If you already have one GPU installed, carefully remove it by releasing any locking mechanisms, and then detach the PCIe power connectors.

Install the second GPU

Place the second GPU in an available PCIe slot on your motherboard. Secure it with any locks or brackets provided by your case.

Connect Power

Attach the required PCIe power connectors from the PSU to both graphics cards. Make sure they are securely connected.

Reassemble and power on

Reassemble your PC, ensuring that all cables and components are correctly seated. Plug your PC back in and power it on.

Driver Installation

Install the necessary drivers for your graphics cards, which can usually be downloaded from the manufacturer’s website.

Common Pitfalls and Challenges

While running a dual GPU system can significantly boost your PC’s performance, there are common challenges to be aware of:

  • Compatibility: Not all games and applications can take full advantage of dual GPUsSome may not benefit from the additional graphics power, and others may even perform worse.
  • Micro-Stuttering: Dual GPU setups can experience micro-stuttering, where frames are not delivered consistently, resulting in a less smooth gaming experience.
  • Driver Support: Keep an eye on driver updates from GPU manufacturersSometimes, new game releases may not be immediately optimized for dual GPU configurations.
  • Power and Heat: Dual GPUs generate more heat and consume more power, necessitating better cooling solutions and potentially a more robust power supply.
  • Cost: The cost of a second graphics card, along with the power supply and potential cooling solutions, can be substantial.


Can I use my existing power supply for a dual graphics card setup?

It depends on your PSU’s wattage and connectorsYou may need to upgrade to a higher-wattage PSU.

Is a modular power supply necessary for a dual GPU system?

While not mandatory, a modular PSU helps with cable management, ensuring a clean and efficient build.

Are there specific power supply brands known for dual GPU setups?

Yes, brands like EVGA, Corsair, and Seasonic offer reliable PSUs suitable for multiple graphics cards.

What if I plan to overclock my GPUs in a dual-card configuration?

You should choose a power supply with additional wattage to accommodate the increased power demands of overclocking.

Do I need a separate power supply for each graphics card?

No, one high-wattage PSU with enough connectors can power both graphics cards in a dual GPU setup.


In conclusion, understanding What power supply do I need for two graphics cards? is a crucial aspect of building a high-performance PC with a dual GPU setupYour choice of power supply unit (PSU) directly impacts the stability and efficiency of your systemBy accurately calculating the power requirements of both graphics cards, CPU, and other components, you can ensure that your dual GPU configuration runs smoothly without any power-related bottlenecks.

Selecting the right PSU with adequate wattage, modular cable options, high efficiency, and future-proofing in mind is essentialIt not only guarantees a seamless dual graphics card experience but also offers room for potential upgrades and ensures the long-term reliability of your system.So, whether you’re a gamer, content creator, or professional user, the right PSU choice is the key to unlocking the full potential of your PC and taking your computing experience to the next level.

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