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Choosing the Best Power Supply for Intel's Core i9-13900K CPU

Learn how to choose a power supply for Intel's Core i9-13900K CPU based on power consumption and other factors.

Choosing the Best Power Supply for Intel's Core i9-13900K CPU Kevin Jones / TechReviewer

Last Updated: March 24, 2023

Written by Kevin Jones

In this article, I'll go over the things you should consider when choosing a power supply for your computer with an Intel Core i9 13900K processor.

Check out my Recommended PSUs below.

Check another CPU:

How to Choose a Power Supply for the 13900K CPU

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The main job of a power supply is to convert the alternating current (AC) from your wall outlet into the direct current (DC) needed by the components inside your computer.

By adding up the power draw of each PC component, we can estimate our power supply needs.

Power Output

An important factor when buying a PSU is the supported wattage.

You will need to add up the power consumption of each computer component to determine the total output power requirements for your power supply.

The peak power consumption of Intel's Core i9-13900K CPU is 253 W.

You can estimate your power requirements by using the following chart.

ComponentPeak Power Usage
13900K CPU253 W
Top-Tier Graphics Card (e.g., Nvidia RTX 4090)450 W
Mid-Tier Graphics Card (e.g., Nvidia RTX 3060)170 W
Motherboard80 W
Optical Drive30 W
3.5" Hard Drive9 W
M.2 or 2.5" SSD9 W
140 mm Case/CPU Fan6 W
120 mm Case/CPU Fan6 W
80 mm Case/CPU Fan3 W

By adding up these numbers, you can estimate peak power usage. Check out the top-tier, mid-tier, and value-tier example builds below.

It's generally a good idea to add a 100–150 W buffer to your expected usage. This buffer will give you some flexibility in case of miscalculations and will allow you to add more drives, fans, or add-in cards in the future.

In most cases, buying a little more wattage than you need is a safer choice for ensuring system stability.

Don't forget to account for the additional power required for overclocking if you intend to overclock your CPU or GPU. Overclocking could require roughly an extra 50–100 W, depending on how much you overclock these devices.

Top-Tier Estimate:

Top-Tier ComponentsPeak Power Consumption
13900K CPU253 watts
Top-Tier Graphics Card (e.g., Nvidia RTX 4090)450 watts
Motherboard80 watts
4 M.2 or 2.5" SSDs36 watts
3 Case Fans (120 mm)18 watts
2 CPU Fans (120 mm)12 watts
Total Estimate:849 watts
Recommended Power Supply Wattage:1000 watts

Check the latest price of the 750–1650 watt Thermaltake Toughpower GF3 ATX 3.0 Power Supply on Amazon (affiliate link).

Featured 1000 Watt PSUs › Amazon Affiliate Links Corsair RMX Series (2021), RM1000x, 1000 Watt, Gold, Fully Modular Power Supply,Black Corsair RMX Series (2021), RM1000x, 1000 Watt, Gold, Fully Modular Power Supply,Black Check Price on Amazon

Mid-Tier Estimate:

Mid-Tier ComponentsPeak Power Consumption
13900K CPU253 watts
Mid-Tier Graphics Card (e.g., Nvidia RTX 3060)170 watts
Motherboard80 watts
2 M.2 or 2.5" SSDs18 watts
2 Case Fans (120 mm)12 watts
2 CPU Fans (120 mm)12 watts
Total Estimate:545 watts
Recommended Power Supply Wattage:700 watts

Check the latest price of the 450–750 watt Corsair SF Power Supplies on Amazon (affiliate link).

Featured 750 Watt PSUs › Amazon Affiliate Links Corsair RMX Series (2021), RM750x, 750 Watt, Gold, Fully Modular Power Supply Corsair RMX Series (2021), RM750x, 750 Watt, Gold, Fully Modular Power Supply Check Price on Amazon

Value-Tier Estimate:

Value-Tier ComponentsPeak Power Consumption
13900K CPU253 watts
Integrated Graphics (No Graphics Card)0 watts
Motherboard80 watts
1 M.2 or 2.5" SSD9 watts
1 Case Fan (120 mm)6 watts
1 CPU Fan (120 mm)6 watts
Total Estimate:354 watts
Recommended Power Supply Wattage:500 watts

Check the latest price of the 450–750 watt Corsair SF Power Supplies on Amazon (affiliate link).

Power Efficiency

PSUs with higher efficiency ratings use less energy and produce less heat, improving their reliability and reducing noise.

The 80 PLUS certification program for power supplies helps to promote energy efficiency by indicating its efficiency rating.

Higher efficiency power supplies may have a higher upfront cost. However, they could potentially save you money on electricity in the long run.

Lower wattage PSUs will be more power-efficient even when idle. For this reason, you may be able to save more on electricity by getting the correct wattage of PSU than by getting the one with the best 80 PLUS rating.

PSU Efficiency Levels (115 V)
Certification Level 10% Load 20% Load 50% Load 100% Load
80 Plus 80% 80% 80%
80 Plus Bronze 82% 85% 82%
80 Plus Silver 85% 88% 85%
80 Plus Gold 87% 90% 87%
80 Plus Platinum 90% 92% 89%
80 Plus Titanium 90% 92% 94% 90%



Make sure your PSU has the correct connectors to support the hardware in your system. Cheaper PSUs may cut costs on connectors and cables by offering fewer options and shorter lengths.

Check with your motherboard and graphics card documentation to determine which connector types are needed. Buy a popular, recently-released PSU; it will likely have the necessary connectors for a new PC build. However, if you use old components or an old power supply, you may find some incompatibilities.

Here are some common connector types that power supplies support:

  • 24-pin connector for the motherboard
  • 4/8-pin connector for the CPU
  • 6/8/16-pin connectors for graphics cards
  • SATA Power connector for each SATA HDD or SDD storage device

The latest graphics cards and ATX 3.0 PSUs support a new 16-pin PCIe 5.0 connector that replaces multiple 8-pin connectors.

Modular Cables

Typical power supplies come with various cables to connect your components. However, extra unused power cables can work against you by interrupting airflow.

In comparison, modular and semi-modular power supplies allow for attaching only the cables you need. As the name implies, semi-modular power supplies have some wires soldered on, while you can optionally connect others.

Cable Lengths

Most power supplies will have cables long enough to support mid-sized towers comfortably. If you have a full-size tower, you may want to check reviews and documentation to ensure that the cables are long enough to allow good cable management.

Power Supply Form Factors

Various form factors are available for power supplies. However, a standard-size desktop PC build will use an ATX power supply.

Small form factor PSUs allow for usage in many computer case shapes, including mini-PCs.

Power Supply Features

Overvoltage protection and short circuit protection can help to save your components in the case of a surge or accident.

LED lighting is another feature you might consider, depending on your PC goals.

Choosing a Cost-Effective Power Supply for the 13900K

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Perhaps you live in a dorm or a family member's house and don't pay the power bill. Or maybe you don't expect the computer to have heavy daily usage. In those cases, the lower upfront cost of a less efficient PSU may be the better choice.

On the other hand, if you care more about the electric bill or the environment and plan to maintain a higher CPU usage, then a more efficient PSU may be better.

Don't go too far over 150 W above your expected power needs. Rightsizing your power supply will keep electricity costs to a minimum, as higher wattage PSUs will consume some additional power, even when idle.

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Learn More About the Intel Core i9-13900K

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You can find detailed 13900K specifications on Intel's site.

Other Considerations When Building a PC

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Want to brush up on other new technologies to consider when building a computer? Check out these articles:

A Note From the Authors

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