Best PSU for 3090

When the RTX 2000 series was upgraded to the RTX 3000 series, the power requirements increased significantly. Especially when you compare it to Nvidia’s largest GPU, the RTX 3090 GPU, with over 10,000 CUDA cores and 24 GB of GDDR6 memory. The Ray Tracing and Tensor cores need the energy to take full advantage of all that processing power. This article explains the best power supply for NVIDIA RTX 3090 graphics cards.

An RTX 3090 is far more demanding than the best GPU, the RTX 2080 TI. A 650W power supply can usually power 2080 without any issue.  As a result, the GPU will not provide enough power to run the 3090, so we will need a more robust power supply.

According to Nvidia, an RTX 3090 system requires a 750W power supply. An RTX 3090 graphics card requires 350W of power. The CPU controls almost everything else. 750W will be enough if your system contains an Intel i5 / i7 or Ryzen 5 / Ryzen 7 processor. For example, an I9 or Ryzen 9 will increase the power demand to 850W.

Additionally, you’ll need a 1000W power supply if you’re using a Threadripper for a solid workstation. If your current PSU is too old or powerful, you may need a more robust power supply to power the RTX 3090. The following factors should be taken into consideration.

Our Top 3 Recommendations

Best Pick Thermaltake PS-SPD-0700NPCWUS-W Thermaltake PS-SPD-0700NPCWUS-W

Reasonable price

good and quiet

Most Popular EVGA SuperNova 850 P2 EVGA SuperNova 850 P2

nylon coated cables

Modular Cable Management

extended durability

Budget Pick Corsair RM850X Corsair RM850X

Low inrush currents

Fully modular

10 Years Warranty

Best PSU for 3090 Summary

Image Model Price
Thermaltake PS-SPD-0700NPCWUS-W Thermaltake PS-SPD-0700NPCWUS-W See On Amazon
EVGA SuperNova 850 P2 EVGA SuperNova 850 P2 See On Amazon
Corsair RM850X Corsair RM850X See On Amazon
NZXT C850 NZXT C850 See On Amazon
EVGA SuperNova 850 GA EVGA SuperNova 850 GA See On Amazon
Seasonic Focus Plus 750FX Seasonic Focus Plus 750FX See On Amazon
Thermaltake Toughpower GF1 750W Thermaltake Toughpower GF1 750W See On Amazon
CoolerMaster MasterWatt 750 CoolerMaster MasterWatt 750 See On Amazon
Corsair SF Series SF750 Corsair SF Series SF750 See On Amazon

Best PSU for 3090 At a Glance:

Best PSU for 3090 Reviews

Thermaltake PS-SPD-0700NPCWUS-W (Image credit: Amazon)

Thermaltake PS-SPD-0700NPCWUS-W


Reasonable price

good and quiet


High inrush current with 230V input

The Thermaltake Smart 700W 80+ White Certified PSU is a top-of-the-line power supply unit that offers superior efficiency and quiet operation.

Equipped with a single +12V rail design, this PSU ensures stability and reliability, giving you peace of mind with its 5-year warranty.

Its ultra-quiet 120mm fan makes it perfect for home and office use, keeping noise levels to a minimum, while maintaining the performance and power of your computer.

The fan is programmed to minimize any whirring noises during operation, ensuring a quiet work or study environment.

With 700-watt power output, 8.9 x 4 x 7 inches in size, and air cooling, this PSU delivers ample power for demanding tasks.

It also boasts an 80-plus certification, a minimum input voltage of 100 volts, and a continuous power design with a strong thermal protection system, ensuring reliable performance even in demanding situations.

Upgrade your setup with the Thermaltake Smart 700W 80+ White Certified PSU and enjoy the peace of mind that comes with a 5-year warranty. With its quiet operation and constant power design, you can concentrate on your work or study with ease.

EVGA SuperNova 850 P2 (Image credit: Amazon)

EVGA SuperNova 850 P2


nylon coated cables

Modular Cable Management

extended durability


Releases a burning smell

The EVGA SuperNova 850 P2 is the perfect power supply for those who demand high-quality and are willing to invest a bit more for it. Designed for computers with two graphics cards, this 850W power supply is built to handle high-performance systems.

It is capable of powering the demanding RTX 3090 graphics card, which requires 350 watts, and a high-speed i9 or Ryzen 9 processor that has been overclocked.

One of the key features of the P2 is its robust +12V rail design, ensuring the best possible output from the power supply. The minor rails may not be as strong as in other units, but they are sufficient for a high-end system.

Additionally, the P2 is entirely modular, allowing you to only use the cables you need, improving cable management and making maintenance easier.

This power supply is also rated Platinum and offers a passive cooling mode, which operates quietly and efficiently. With the option of a passive cooling mode and modular cables, the P2 offers both quality and versatility, making it a great choice for those who demand the best.

So, upgrade to the EVGA SuperNova 850 P2 and experience reliable and efficient power for your high-performance system.

Corsair RM850X (Image credit: Amazon)

Corsair RM850X


Low inrush currents

Fully modular

10 Years Warranty


In-cable capacitors

Narrow space between peripheral connectors

The Corsair RM850x is a top-performing and reliable power supply, solidifying its place as a leading manufacturer in the market. With its efficient and steady single +12V rail design, this power supply delivers a consistent output to keep your high-end system running smoothly.

The minor rails, which boast a combined power output of 150W, are more than enough to handle the demands of even the most advanced CAD systems. The compact 160mm size of the RM850x allows for easy integration into a variety of PC cases and cable management solutions.

The modular design of the RM850x allows for customization and flexibility, and the non-bending cables provide a tidy and organized setup. While the option to upgrade to single-sleeved cables is available, it would come at an additional cost.

Moreover, this power supply is designed to operate with high stability, even in the most demanding conditions, due to its high-quality capacitors and voltage regulators.

This means that the power supply will be able to provide consistent power, even when the system is running at its full load, without any fluctuations in performance.

This is especially important for high-end graphics cards like the RTX 3090, which requires stable and consistent power to function optimally.

NZXT C850 (Image credit: Amazon)



Fully Modular cable management

Full power at 47 degrees Celsius

Good Aesthetics


Noisy At Over 80% Capacity

The NZXT C850 is an exceptional power supply for RTX 3090 computers that can support processors like the Ryzen 9 3950X and i9 10900K.

Despite facing stiff competition from other units in the same category, such as the Corsair RM850X, the C850 stands out with its compact and modular design, making it a great choice for efficient cable management.

However, its cooling fan, which is limited to only one 120mm unit, can produce noise when the machine is running at maximum capacity. The reduced noise fan mode may only prove useful during light tasks, making it somewhat of a lackluster feature.

One of the main drawbacks of the C850 is its high price compared to other power supplies with similar capabilities. This may be due to the included monitoring software, which is a useful tool, but can be substituted with other monitoring methods like monitoring temperature.

In conclusion, the C850 is a good power supply option, but it may be considered overpriced. It is recommended to purchase the C850 during discounted offers, especially given its 10-year warranty.

EVGA SuperNova 850 GA (Image credit: Amazon)

EVGA SuperNova 850 GA


10 Year Warranty

Fully Modular

Pretty quite at normal usage


Not so efficient 5VSB rail

The EVGA SuperNova 850 GA is a top-of-the-line power supply from one of the leading manufacturers in the industry.

Designed to perfectly complement the RTX 3090 graphics card, this power supply provides ample power and efficiency with a maximum output of 90%.

The SuperNova 850 GA boasts a modular design, allowing for seamless integration and cable management. Built with quality components, it also comes with the added reassurance of a 10-year warranty from EVGA.

This compact power supply is engineered to fit effortlessly into a variety of cases, all while maintaining optimal cooling performance.

The ECO mode function enables the fan to remain silent when the load is below 40%. When in full operation, the double ball bearing design ensures quiet and smooth performance.

For PC users looking for a reliable power supply for their RTX 3090 setup, the EVGA SuperNova 850 GA is a worthwhile investment.

It offers quality, efficiency, and a peace of mind warranty, making it a solid choice for most users, excluding those who may require more power for a Threadripper setup.

Seasonic Focus Plus 750FX (Image credit: Amazon)

Seasonic Focus Plus 750FX


High Efficiency

Reasonable price

High Build Quality


Little bit stiff cables

Noisy under rough conditions

The Seasonic Focus Plus 750FX is a compact and highly efficient power supply, designed to deliver reliable and stable power to your computer.

With its patented three-stage fan control system, this PSU operates quietly, ensuring maximum quietness even during high loads.

The fan control system is highly efficient and can be adjusted with a switch located at the back of the unit.

This power supply boasts a unique two-stage fan control system, making it one of the more innovative products on the market. With less than a 30% load, the fan remains off, and when the load reaches 50%, the fan operates in silent mode, adjusting its speed as the load increases.

This power supply is ideal for consumer-grade CPUs such as the Intel i7 and AMD Ryzen 7. With a minimum of disturbances and variations, you can be assured of both reliability and efficiency.

The +12V rail is designed with load balancing in mind, ensuring a stable and steady supply of power.

If you’re looking for a compact, efficient and reliable power supply for your computer, the Seasonic Focus Plus 750FX is a highly recommended option.

Thermaltake Toughpower GF1 750W (Image credit: Amazon)

Thermaltake Toughpower GF1 750W


Long enough hold-up time

Pretty much number of connecters


No MOV in the transient filter

The Thermaltake Toughpower GF1 750W is a must-have for those who seek a perfect balance between system cooling and cable management.

Its powerful processing capabilities make it an ideal choice for powering Nvidia’s RTX 3090, while its efficiency ensures low utility bills for those who don’t require high-end processors like the i9 or Threadripper.

Designed with cable management in mind, the GF1 features low-profile flat cables that offer effortless installation in tight spaces.

These cables are designed for easy handling and arrangement, making cable management a breeze.

Reliability is at the core of the GF1’s design, ensuring only minimal ripple noise of under 30mV. Its near-Platinum efficiency level ensures stable voltage and eliminates reliability concerns. Rest assured, the GF1 is a dependable choice for your power needs.

Moreover, the Toughpower GF1 750W is equipped with a powerful single +12V rail that can handle even the most demanding systems and it comes with a seven-year warranty, giving you peace of mind knowing that you’re protected from any potential issues.

It also has a built-in 135mm fan that operates quietly and efficiently, keeping your system cool and reducing the risk of thermal-related problems.

With a sleek and stylish design, the Toughpower GF1 750W is not only a reliable power source but also a great addition to your system’s aesthetics.

CoolerMaster MasterWatt 750 (Image credit: Amazon)

CoolerMaster MasterWatt 750


5 Year Warranty

Semi-Modular Cable management

High Build Quality



The CoolerMaster MasterWatt 750 is an excellent choice for those looking for a budget-friendly power supply that still offers ample power and reliability. With its bronze rating and 750W output, this power supply is a great option for mid-range builds featuring processors such as the i5/i7 and Ryzen 5/7.

The RTX 3090, when paired with the rest of the system components, should not pose a problem for this power supply.

One of the standout features of the MasterWatt 750 is its semi-modular design, which makes it an ideal choice for users who are looking to keep their builds neat and tidy. The semi-modularity means that users only need to install the cables that they need, reducing cable clutter and improving cable management.

Additionally, this power supply comes with a fanless mode that kicks in when the load drops below 15 percent. This results in silent operation during low-load scenarios, making it an excellent option for users who value a quiet computing experience.

The 120mm fan on this power supply is incredibly quiet, even when the load increases. Despite its small size, the fan is capable of providing sufficient cooling, and it will automatically activate when the load hits 15 percent.

This is a testament to the engineering prowess of CoolerMaster, who have designed a fan that is both efficient and quiet.

In terms of safety features, the MasterWatt 750 offers everything you would expect from a power supply of its quality. It is a safe and reliable fan, with a very high-efficiency rating, making it an ideal choice for users who are looking to build a system that doesn’t require a lot of processing power.

All in all, the CoolerMaster MasterWatt 750 is a great option for those looking for a budget-friendly, yet reliable and efficient power supply for their mid-range builds.

Corsair SF Series SF750 (Image credit: Amazon)

Corsair SF Series SF750


7 Year Warranty

Tight Load Regulation


Pretty expensive

Low hold-up time

The Corsair SF Series SF750 is a top-performing SFX power supply that is designed to deliver unmatched reliability and power for small form factor processors.

As a Platinum-rated power supply, it provides ample power to support even the most demanding components, including the Nvidia RTX 3090.

The compact 92mm fan features a Zero RPM cooling mode, which allows the power supply to remain silent while keeping the temperatures under control.

Safety features such as over-voltage protection, short circuit protection, and over-temperature protection are included to ensure a secure and stable performance.

The SF750 is a modular power supply, allowing for a customized setup and easy cable management. The included individually sleeved cables are of the same size as the unit, making it simple to manage even in the tightest spaces.

For a seamless SFX experience, it’s recommended to pair the RTX 3090 with a processor that consumes less power, such as the Ryzen 7 2700X.

While the SF750 is priced on the higher side, its exceptional performance, reliability, and safety features make it a worthwhile investment for those who demand the best for their small form factor builds.

How To Choose The Best PSU For RTX 3090

The power supply unit (PSU) is a crucial component of your computer system as it supplies power to all the other components.

Choosing the right power supply for your RTX 3090 can be a daunting task, but with the right information and guidelines, you can make an informed decision. Here are the important factors to consider when choosing the best PSU for RTX 3090.

Power Output

One of the most important factors when choosing a power supply for your RTX 3090 is the power output. The RTX 3090 requires a minimum power supply of 750W, with a recommended power output of 850W or higher.

Make sure to choose a power supply that has a power output that exceeds the minimum requirements to ensure that it can handle the power requirements of your RTX 3090 and other components.

Efficiency Rating

The efficiency rating of a power supply is a measure of how much energy is lost as heat during the conversion process. A higher efficiency rating means that less energy is lost as heat, which means lower energy bills and a more stable power supply. A power supply with an 80 Plus Platinum or Titanium efficiency rating is recommended for the RTX 3090.


Modularity refers to the ability to easily add or remove cables from the power supply. A modular power supply is more convenient as it allows you to customize your cable configuration, making cable management easier and more efficient. If you are looking for a clean and organized build, a modular power supply is a good choice.

Size and Form Factor

The size and form factor of the power supply should also be considered when choosing the best PSU for RTX 3090. The RTX 3090 is a high-end graphics card, and it is recommended to use a full-size ATX power supply for optimal performance.

If you are building a small form factor (SFF) system, you can choose an SFX power supply, but make sure it is powerful enough to handle the RTX 3090’s power requirements.


Choosing the right power supply for your RTX 3090 is a crucial aspect to ensure a smooth and high-performance gaming experience. The ideal power supply should have a minimum capacity of 750W, with a more powerful option being 1,000W.

As different processors have varying power requirements, it is important to compare the specifications of different power supplies and select the one that meets your needs. The EVGA Supernova 850 P2, SilverStone Technology Strider 850, Corsair AX Series AX850, and Corsair AXI Series AX1200i are all excellent options to consider.

Each one of these options offers different benefits and features, with the Corsair AXI Series AX1200i being the ultimate choice for those who want to invest in an overkill power supply that provides extra headroom for the hardware components.

However, it comes with a higher price tag. Ultimately, the best power supply for you will depend on your individual requirements and budget.

Frequently Asked Questions

Is the RTX 3090 the right choice for you?

There are a number of content creators and gamers that are looking for the best graphics card for their money. Those who consider themselves to be able to utilize the large 24 GB memory buffer for 3D animation, graphics, and raw 8K footage editing, if that is the case, then you will surely be satisfied with the RTX 3090.

 Is it worth buying a 3090?

The card must be sold at or above MSRP in order to qualify for the discount. If a card costs a lot more than its MSRP, it is likely to be a higher performance RTX 3080 or 3080 Ti which provide high value considering their prices. The 3090 is worth the purchase if you are able to benefit from 24 GBs of GDDR6X memory buffer for professional work, and if money is not an issue for you.

Can I use an RTX 3090 with an i9? What power supply do I need?

In terms of the motherboard requirements for the NVIDIA GeForce RTX 3090, you will need a 750W power supply if you pair the card with a mainstream Core i5/i7 processor or Ryzen 5/7 processor. Those requirements jump to 850 Watts for Intel Core i9 and Ryzen i9 processors with peak requirements of 1000 Watts for Intel HEDT and AMD Threadripper processors.

Asad Malik
Greetings, my name is Asad Malik, and I have done my intermediate in Computer Science, and I am very interested in keeping up to date with the latest tech products, buying them, and writing about them.