Does Power Supply Consumption Change If You Dual Monitor?

With the increasing use of multiple monitors in various work environments, it's common for users to wonder about its impact on power supply consumption. To provide a detailed explanation, we delve into the topic considering various aspects and address the frequently asked questions related to power usage when using dual monitors.

The Basics of Power Supply Consumption

Before discussing the impact of dual monitors on power supply consumption, it's essential to understand how power consumption is typically calculated. The power consumed by an electronic device is measured in watts (W). Most computer components, including the power supply, are rated with their maximum power output capacity, which indicates the amount of power they can deliver when required.

When it comes to power supply units (PSUs), they are designed to supply power according to the demand of the system components connected to it. The actual power consumed by a computer depends on various factors, such as the processor, graphics card, storage drives, peripherals, and any additional components or accessories.

The Impact of Dual Monitors

Adding a second monitor to your computer setup can increase power consumption, but the overall impact is relatively minimal. The additional power drawn by the second monitor largely depends on its size, resolution, and type (LCD, LED, etc.). Modern monitors are energy-efficient, and advancements in display technology have significantly reduced their power requirements compared to older models.

A single LCD monitor with a standard resolution typically consumes around 20-50 watts of power during regular usage. When you add a second monitor, the power consumption might increase by roughly 10-30 watts, depending on the aforementioned factors. Thus, the total power draw of a dual monitor setup could range from 30 to 80 watts, which is still well within the capacity of a standard power supply unit.

Factors Affecting Power Consumption

While dual monitors themselves contribute relatively little to power supply consumption, there are other factors that can increase the overall power usage of your setup. These factors include:

  • Graphics card: If you're using a dedicated graphics card on your system, it has its own power requirements, especially if you engage in graphics-intensive tasks. However, most modern graphics cards are designed with energy efficiency in mind.
  • Processor: CPUs with higher processing power usually draw more power. If you frequently engage in tasks that heavily rely on the processor, such as video editing or gaming, it may contribute to increased power consumption.
  • Peripherals: Additional peripherals like external hard drives, USB devices, or gaming accessories draw power from the system. While their individual power requirements might be low, the cumulative impact should be considered.

Frequently Asked Questions

Q: Will using dual monitors significantly increase my electricity bill?

A: No, the increase in power consumption due to dual monitors is not significant enough to cause a noticeable change in your electricity bill. Modern monitors are designed to be energy-efficient, and the overall power draw of a dual monitor setup, including the system unit, remains well within the range of a standard power supply unit's capacity.

Q: Can my existing power supply handle dual monitors?

A: In most cases, yes. As mentioned earlier, the power draw of dual monitors is within the capacity of standard power supply units. However, it's always a good idea to check the specifications of your power supply and ensure it meets the requirements of your entire system, taking into consideration all the components and peripherals.

Q: Are there any energy-saving measures for dual monitor setups?

A: Yes, there are several steps you can take to optimize energy usage in a dual monitor configuration:

  • Enable power-saving features on your monitors and ensure they enter sleep mode when not in use.
  • Adjust the display brightness and screen timeout settings according to your requirements.
  • Consider using newer monitor models that are specifically designed to be energy-efficient.
  • When purchasing a new power supply unit, choose a model with higher efficiency ratings (80 Plus certified).

By implementing these measures, you can further minimize the impact on power consumption and contribute to a more sustainable computing setup.


In conclusion, the additional power supply consumption caused by dual monitors is relatively small compared to the power requirements of the rest of your computer components. While the exact increase in power draw depends on factors like monitor type, size, and resolution, it usually ranges from 10 to 30 watts per monitor. Modern power supply units are designed to handle such increments without any issues.

However, it's crucial to consider the power requirements of your entire system, including the dual monitors, graphics card, processor, and peripherals. Ensuring that your power supply unit has sufficient capacity to handle the overall power needs of your computer setup is crucial to prevent any potential issues.

Remember to implement energy-saving measures to optimize power consumption and contribute to a more efficient and environmentally-friendly computing experience.


The information provided in this blog post is accurate to the best of our knowledge, but we take no responsibility for any damages or losses incurred due to the application of the information presented here. Always consult the user manual and manufacturer's specifications for your specific hardware components and follow the recommended guidelines.