Best PSU for 4090 in 2024

Selecting the right power supply unit (PSU) ensures optimal performance and stability in any high-end gaming or professional PC build. As technology advances and graphics cards become more powerful, the demand for robust and reliable power delivery systems has never been higher. In cutting-edge graphics cards, the NVIDIA GeForce RTX 4090 stands out as a pinnacle of gaming prowess and computational capability. 

Best PSU for 4090 in 2024

To harness the full potential of this graphics powerhouse, choosing the best PSU becomes a critical decision for enthusiasts and professionals alike. In this guide, we will explore and recommend the top contenders for the title of the “best PSU for 4090,” considering factors such as power efficiency, reliability, modularity, and the specific requirements of this high-performance GPU. Join us on this journey to ensure that your gaming or professional rig is equipped with the ideal power supply to unleash the full capabilities of the RTX 4090.

What is PSU

The Power Supply Unit, often called PSU, can be likened to the heart of your gaming set-up. Just as the heart pumps blood throughout the body, keeping it alive and kicking, PSUs distribute power throughout your device, ensuring flawless gaming experiences. At its core, a good quality PSU is critical for game performance; it propels the life force into every component, from graphics cards to motherboards.

When considering upgrading or building a gaming computer from scratch, selecting an appropriate PSU should never take a backseat. The reality is that the longevity and stability of other components significantly depend on it. A poor-quality or inadequately rated PSU could cause system failures or irreparable damage – certainly not what any gamer desires! The subtle complexity hidden within this box of cables holds sway over your future gaming endeavors.

Top 7 PSUs for NVIDIA GeForce RTX 4090

Diving into the power-packed gaming universe with the phenomenal NVIDIA GeForce RTX 4090 builds a whole new level of excitement. However, this extraordinary graphic processing unit demands equally efficient Power Supply Units (PSUs) for flawless performance. So, which PSUs can supercharge your favorite gaming weapon? Let’s uncover the top 7 performing PSUs that bring out the best in your RTX 4090.

1. Corsair RM850x

Corsair RM850x

The Corsair RM850x is a gold-rated power supply unit (PSU) with 80 PLUS Gold efficiency. This ensures minimal energy wastage, reduces electricity bills, and promotes responsible energy use. Enjoy a quieter computing experience with the RM850x’s low-noise fan feature. The PSU runs silently at low to medium loads, ensuring that your workflow or gaming session isn’t disrupted by unnecessary noise.

The fully modular design of the Corsair RM850x provides optimal flexibility for system builders. It allows you to use only the necessary cables, leading to better airflow management and a cleaner-looking build. Experience silent operation even at full load with the Zero RPM mode that stops the fan entirely when the load is low. 

This advanced feature enhances the overall longevity of your power supply while maintaining a peaceful environment. Experience silent operation even at full load with the Zero RPM mode that stops the fan entirely when the load is low. This advanced feature enhances the overall longevity of your power supply while maintaining a peaceful environment.


  • Fully modular design for customizable cable management and reduced clutter.
  • 80 PLUS Gold efficiency rating ensures high energy efficiency and reduced waste heat.
  • Powerful 850W capacity is suitable for high-end gaming and demanding applications.
  • Zero RPM fan mode under low to moderate loads for silent operation.
  • Compatibility with multi-GPU setups and high-performance gaming rigs.
  • Japanese capacitors for reliable and long-lasting performance.


  • It may be overkill for systems with lower power requirements.
  • Larger sizes may pose challenges for smaller PC cases with limited space.
  • Black color may not match all build aesthetics.

2. Cooler Master V850 SFX Gold

Cooler Master V850 SFX Gold

The Cooler Master V850 SFX Gold Full Modular delivers 850W of power, ensuring stable and continuous power with 80 Gold efficiency. It’s the best PSU for 4090, capable of supporting high-end systems without issues while reducing electricity usage and heat generation. This fully modular power supply unit allows you to use only the necessary cables. This not only improves airflow and reduces clutter within your system but also enhances the overall aesthetics of your build, making it an optimal choice for 4090 users.

Equipped with a Quiet FDB Fan, this PSU operates at lower noise levels even under heavy load, ensuring a distraction-free environment while gaming or working on demanding tasks. The fan’s unique design reduces friction, increasing its longevity and reliability, which is crucial for 4090 users. The Cooler Master V850 SFX Gold Full Modular has a staggering 10-year warranty, providing peace of mind to users investing in their dream setup. 

This extended warranty period signifies the brand’s confidence in its product’s durability and performance. Despite delivering 850W of power, this PSU boasts a compact SFX form factor that saves space inside your PC case while offering easy installation. The included ATX bracket ensures compatibility with most cases today, making it an ideal fit for those using RTX 4090 GPUs.


  • SFX form factor provides compatibility with smaller and compact PC cases.
  • 850W capacity meets the demands of high-end GPUs like the RTX 4090.
  • Fully modular design for efficient cable management and reduced clutter.
  • 80+ Gold efficiency rating ensures high energy efficiency and reduced heat.
  • Quiet FDB fan design enhances overall system acoustics.
  • A 10-year warranty reflects confidence in long-term reliability.


  • Limited visual customization compared to some enthusiast-grade units.
  • It may require additional cable management effort due to the fully modular design.

3. MSI MPG A1000G


The MSI MPG A1000G PCIE 5 & ATX 3.0 Gaming Power Supply is not just any ordinary power supply. It boasts an 80 Plus Gold certification, signifying that it runs at more than 90% efficiency under typical loads, saving you electricity costs while delivering top-notch performance. Don’t be alarmed by this PSU’s power; its compact size ensures simple installation into your gaming setup. It’s designed to fit comfortably within your system without compromising performance or efficiency.

Equipped with 100 Japanese 105 C capacitors, this power supply guarantees a longer lifespan and stability under extreme gaming conditions. These capacitors are renowned for their superior quality and durability, ensuring your gaming sessions remain uninterrupted. With its fully modular design, the MSI MPG A1000G allows you to use only the cables you need, reducing clutter and promoting better airflow in your system. This feature enhances the aesthetic appeal of your rig while ensuring optimal thermal performance. 

This powerful power supply unit offers unparalleled compatibility, making it the best PSU for NVIDIA’s GeForce RTX™ 4090 graphics card. It secures a steady flow of power to bring out maximum potential from all components, giving you a supreme gaming experience like never before.


  • Robust 1000W capacity meets the demands of high-power GPUs like the RTX 4090.
  • Full modular design for efficient cable management and reduced clutter.
  • PCIe 5.0 and ATX 3.0 support for compatibility with the latest technologies.
  • Active Power Factor Correction (PFC) for improved power efficiency.
  • Comprehensive protection features for added system safety.
  • MSI’s brand reputation for quality and performance in gaming components.


  • Limited visual customization compared to some enthusiast-grade units.
  • It operates more noisily under heavy loads compared to fanless power supplies.

4. Corsair RM1200x Shift

Corsair RM1200x Shift

The Corsair RM1200x Shift Fully Modular ATX Power Supply is 80 Plus Gold certified, ensuring optimal performance with less energy waste. Due to its high efficiency, you can count on stable energy provision and reduced operational costs. With ATX 3.0 & PCIe 5.0 compliance, this power supply unit stays ahead of the curve. You can connect the latest hardware without compatibility issues, ensuring your system remains future-proof.

Enjoy a virtually silent operation courtesy of the Zero RPM fan mode; it only spins when needed at high power loads, providing an incredibly quiet user experience. Don’t let noise distract you while working or gaming. Built with 105°C-rated capacitors, the Corsair RM1200x Shift offers unmatched durability and longevity in high-stress scenarios. It’s a trustworthy choice for your gaming rig or professional workstation that needs reliable power delivery.

This fully modular design means you only connect the cables you need – minimizing clutter and maximizing airflow inside your PC case. It’s not just about aesthetics; it also improves thermal performance for a longer hardware lifespan.


  • Robust 1200W capacity accommodates demanding components, including the RTX 4090.
  • Fully modular design for customizable cable management and reduced clutter.
  • Modular side interface for a unique and streamlined installation experience.
  • 105°C-rated capacitors for reliable and stable power delivery.
  • Comprehensive protection features for added system safety.
  • 80 Plus Gold efficiency rating ensures high energy efficiency and reduced waste heat.


  • Limited visual customization compared to some enthusiast-grade units.
  • It may be overkill for systems with lower power requirements.
  • Limited availability and potentially higher pricing in competitive markets.

5. Thermaltake Toughpower GF3

Thermaltake Toughpower GF3

The Thermaltake Toughpower GF3 850W power supply unit is 80 Gold certified, ensuring superb operational efficiency under high loads. This conserves energy and reduces heat generation and noise for a smooth-running system. With ATX 3.0 PCI-E 5.0 readiness, this power supply unit is future-proofed to manage the demands of powerful next-gen hardware. Ideal for those planning to upgrade their systems or build new ones around cutting-edge technology.

Enjoy peace of mind with our incredible 10-year Thermaltake Toughpower GF3 850W PSU warranty. This extended warranty period reflects our confidence in the product’s quality and reliability. Thanks to its True 450W 12VHPWR Connectors on PSU, this unit is compatible with NVIDIA RTX 40 series graphics cards. It supports SLI Crossfire configuration – which is critical for high-end gaming and graphic-intensive tasks.

The Thermaltake Toughpower GF3 offers a robust power output of up to 850W, providing stable performance even under heavy workload scenarios such as gaming or multimedia editing tasks. It’s built with top-notch components that ensure dependable operation when you need it most.


  • True 450W 12VHPWR connectors for efficient and stable power delivery.
  • Specifically designed for the NVIDIA RTX 40 series, ensuring compatibility.
  • ATX 3.0 and PCI-E 5.0 readiness for future-proofing and compatibility.
  • 80+ Gold efficiency rating for high energy efficiency and reduced waste heat.
  • SLI/Crossfire ready for multi-GPU setups and enhanced graphics performance.
  • 850W capacity is suitable for powering high-end components, including the RTX 4090.


  • Limited space for additional drives or storage options.
  • No modular design may lead to cable clutter in certain builds.

6. ASUS ROG Thor 1000W Platinum II

ASUS ROG Thor 1000W Platinum II

The ASUS ROG Thor 1000W Platinum II Fully Modular Power Supply boasts an 80 Plus Platinum certification, ensuring high efficiency and performance. This means less energy is wasted as heat or excess noise, saving you from higher electricity costs. This power supply features unique ROG heatsinks and a 135mm PWM fan to effectively dissipate heat, ensuring the longevity of your system components. The 0dB mode delivers silent operation, perfect for quiet environments or intense gaming sessions.

With its entirely configurable design, the ASUS ROG Thor provides the convenience of utilizing only the essential cables. This contributes to a less crowded PC case interior, promotes improved air circulation, and enables neat assembly. The ASUS ROG Thor has an OLED panel showing real-time power usage data. This cutting-edge attribute lets you track your system’s power use straight from the PSU.

The sleeved cables give your build a more premium look while providing extra protection against wear and tear. Furthermore, with Aura Sync compatibilities, you can synchronize lighting effects across all your compatible devices for a unified aesthetic experience in your gaming setup.


  • Unleashes a whopping 1000W of power for robust gaming setups.
  • Cutting-edge 80+ Platinum efficiency ensures energy savings without compromising performance.
  • Lambda A++ certification guarantees top-tier reliability and performance standards.
  • Sync up your rig’s aesthetics with Aura Sync compatibility, creating a visually stunning setup.
  • Premium build quality and construction from ASUS, a trusted name in gaming hardware.
  • Future-proof your system with ample power headroom for potential upgrades and expansions.


  • The high wattage might be excessive for standard gaming setups, leading to inefficiency.
  • A premium product comes with a price tag, making it less budget-friendly.
  • OLED panel adds a cool factor but may not be essential for users focused solely on performance.

7. NZXT C1200 PSU


The NZXT C1200 PSU delivers 1200 watts of power, making it an ideal choice for high-end gaming PCs and professional-grade workstations. This power makes running GPU-intensive games or software as smooth as silk. Experience maximum energy efficiency with the NZXT C1200 PSU with an 80 Plus Gold rating. This ensures lower heat generation and reduced operational costs, contributing to a more sustainable and economical PC experience in the long run.

The fully modular design allows you to use only the cables you need, reducing clutter within your system promoting better airflow and easier upgrades. This flexibility makes building or upgrading your PC a hassle-free experience. Enjoy silent operation under low and medium loads with the zero-fan mode feature. This keeps your gaming environment quiet while maintaining peak performance, providing a more immersive gaming experience.

Your investment is secured for the long term as the NZXT C1200 PSU offers a whopping 10-year warranty. You can rest easy knowing that this power supply unit will reliably fuel your demanding system for years.


  • A powerhouse with 1200 watts is ideal for demanding gaming and high-performance computing.
  • Embraces the latest ATX 3.0 and PCIe 5.0 standards for cutting-edge compatibility.
  • Achieves impressive energy efficiency with an 80 Plus Gold rating, balancing power and savings.
  • Operates silently during low-load scenarios thanks to the Zero Fan Mode feature.
  • Designed for longevity and reliability, meeting the high standards expected from NZXT products.
  • Long-term peace of mind with a generous 10-year warranty, showcasing confidence in durability.


  • Compatibility may concern older systems that don’t support ATX 3.0 or PCIe 5.0.
  • Black-sleeved cables, while sleek, might be prone to visible wear over time.
  • The power supply unit’s size may challenge smaller form factor builds.

Understanding PSU Requirements for 4090

When assembling a top-notch PC gaming rig, the details you can’t overlook are Power Supply Unit (PSU) requirements specific to the graphics card. And if you’re considering fitting your PC with Nvidia’s behemoth 4090 graphics card, understanding its power needs is paramount. This card beast delivers unparalleled performance and incredible speeds and consumes significant electricity.

Wattage Rating:

The anticipated high energy usage of the RTX 4090 will surpass that of previous models. Therefore, selecting a power supply unit (PSU) with a generous wattage rating is crucial. It is advisable to opt for a PSU with a wattage considerably higher than the GPU’s Thermal Design Power (TDP) to cater for possible overclocking and prolong the lifespan of the PSU.

Efficiency Rating:

Opting for a power supply with a high-efficiency rating (such as 80 PLUS Gold or Platinum) ensures stable power delivery and minimizes energy waste. A more efficient PSU can lead to lower electricity bills and reduced heat generation within the system.


Modular PSUs allow users to connect only the necessary cables, reducing cable clutter inside the case. This improves airflow and makes the installation and maintenance process much more convenient. Modularity is a feature worth considering, given the likely space constraints in a high-performance PC build.

Rail Configuration:

Examining the rail configuration of a PSU is essential. The RTX 4090 may require multiple PCIe power connectors, so ensuring that the chosen power supply has sufficient PCIe connectors on dedicated rails is crucial for stable power delivery to the GPU.

Brand Reputation and Reliability:

One should give priority to reliable and reputable brands. Opting for a top-notch PSU from a trusted maker can offer assurance, given its lower likelihood of failure and subsequent damage to other system components.


Anticipating future upgrades or additions to your system is wise. Choosing a PSU with a higher wattage than the immediate requirements of the RTX 4090 can future-proof your system, accommodating potential upgrades or adding power-hungry components.

Different Types of Power Supply Units

Several power supply units (PSUs) are available, each designed to meet specific needs and preferences. The prior differentiators among these types are their form factors, efficiency ratings, modularity, and intended applications. Here are some of the most common types of power supply units:

ATX Power Supply:

ATX (Advanced Technology eXtended) is the standard form factor for desktop computer power supplies. ATX power supplies are widely used and come in various wattages to acclimate system requirements. They typically feature a 20+4-pin motherboard connector, SATA connectors, and PCIe connectors for graphics cards.

SFX Power Supply:

SFX (Small Form Factor) power supplies are designed for compact PC builds, such as Mini-ITX systems. They are smaller than standard ATX power supplies, making them suitable for cases with limited space. SFX PSUs often come with fewer connectors due to their compact size.

EPS Power Supply:

EPS (Entry-Level Power Supply) units are basic power supplies with essential features. They are commonly found in budget or entry-level systems. While they may lack some advanced features, they still provide the necessary power for basic computing needs.

Modular Power Supply:

Modular power supplies offer flexibility by allowing users to connect only the necessary cables. This reduces cable clutter inside the computer case, improving airflow and making cable management easier. Modular PSUs come in various form factors, including ATX and SFX.

Semi-Modular Power Supply:

Semi-modular power supplies have some fixed cables (usually essential ones like the 24-pin motherboard and CPU power connectors) and detachable cables. Semi-modular power supplies strike a balance between the fixed cables needed in every build and the flexibility of modular cables.

Fully Modular Power Supply:

Fully modular power supplies provide the highest level of customization, allowing users to connect only the cables required for their specific setup. This results in a clean and organized interior with no unused cables taking up space.

80 PLUS Certified Power Supply:

The 80 PLUS certification indicates the energy efficiency of a power supply. The certification comes in various levels, including Standard, Bronze, Silver, Gold, Platinum, and Titanium, with each level representing higher efficiency. Higher efficiency means less energy is wasted as heat.

Redundant Power Supply:

In servers and critical systems where continuous power is crucial, redundant power supplies are often utilized. These power supplies are provided in duos so that if one becomes faulty, the other can seamlessly step in to maintain uninterrupted functioning.

Uninterruptible Power Supply (UPS):

While not a traditional PC power supply, a UPS device provides battery backup during power outages. It allows users to save their work and shut down the computer properly, preventing data loss or component damage.

Factors to Consider When Buying a PSU

There are several crucial elements to consider when purchasing a Power Supply Unit (PSU) for your computer to guarantee its compatibility, efficiency, and dependability. Here is an exhaustive rundown of things you should remember:


Determine the power requirements of your system components, including the CPU and GPU. Choose a PSU with a wattage rating that exceeds the total power draw of these components, allowing for potential upgrades and ensuring stability.

Efficiency Rating (80 PLUS Certification):

Look for PSUs with higher efficiency ratings, such as 80 PLUS Bronze, Silver, Gold, Platinum, or Titanium. A more efficient PSU generates less heat, consumes less power, and often has a longer lifespan.

Form Factor:

Ensure that the PSU’s form factor (e.g., ATX, SFX) is compatible with your computer case. ATX is the standard for most desktops, while SFX is commonly used in smaller form factor builds.


Decide between non-modular, semi-modular, or fully modular PSUs. Modular PSUs allow you to connect only the cables you need, improving cable management and airflow inside the case.


Check the number and type of connectors provided by the PSU, including 24-pin motherboard connectors, CPU power connectors, SATA connectors, and PCIe connectors for graphics cards.

Rail Configuration:

Examine the rail configuration, especially if you have a high-performance graphics card. Ensure there are enough dedicated PCIe connectors and rails to support your GPU.

Brand and Reputation:

Choose a PSU from a reputable brand known for reliability and quality. Reviews and user feedback can provide insights into the performance and durability of specific PSU models.

Build Quality:

Assess the build quality of the PSU, including the materials used and the overall construction. A well-built PSU is more likely to provide stable power and withstand long-term use.

Overcurrent Protection (OCP), Overvoltage Protection (OVP), and Short Circuit Protection:

Look for PSUs with built-in protection mechanisms, such as OCP, OVP, and short circuit protection. These features help prevent damage to your components in case of electrical issues.

Noise Level:

Consider the noise level of the PSU, especially if you prioritize a quiet system. PSUs with larger, slower-spinning fans tend to produce less noise.

Cable Length:

Ensure that the cables provided are long enough to reach all components in your case comfortably. This is particularly important in larger cases.

Price and Warranty:

Compare prices and warranty periods among different PSU models. While it’s tempting to cut costs, investing in a quality PSU with a good warranty can save you money in the long run by protecting your components.

Potential Issues with Inferior PSUs for 4090

Using an inferior or inadequate power supply unit (PSU) for the NVIDIA GeForce RTX 4090 can lead to several potential issues, ranging from degraded performance to severe damage to components. Here are some of the potential issues associated with using an inferior PSU for the RTX 4090:

Insufficient Power Delivery:

Inferior PSUs may not provide the required wattage to adequately power the RTX 4090, leading to instability, crashes, or even system shutdowns under heavy load.

Voltage Instability:

Poor-quality PSUs may struggle to maintain stable voltage levels, which is crucial for the proper functioning of the RTX 4090 and other components. Voltage fluctuations can result in system instability, artifacts, or damage to the graphics card.


Inadequate power delivery can cause the PSU to operate at higher temperatures. This decreases the PSU’s efficiency and can lead to overheating issues within the entire system.

Potential Damage to Components:

An inferior PSU may lack essential protection mechanisms, such as overcurrent protection (OCP) and overvoltage protection (OVP). This increases the risk of damage to the RTX 4090 and other components in the event of power spikes or electrical issues.

Reduced Lifespan:

Poor-quality PSUs are more prone to failure and may have a shorter lifespan. A failing PSU can result in downtime, potential data loss, and the need for costly component replacements.

Inadequate PCIe Connectors:

The RTX 4090 may require multiple PCIe power connectors. Inferior PSUs might need to provide more or sufficiently stable PCIe connectors, limiting the graphics card’s performance or causing compatibility issues.

Compatibility Issues:

Some lower-quality PSUs may lack the necessary connectors or meet the specifications required by the RTX 4090. This can lead to compatibility issues and hinder the proper installation and functioning of the graphics card.

Noise and Coil Whine:

Inefficient power delivery can increase electrical noise and coil whine, affecting the overall user experience. High-quality PSUs with better power regulation can minimize these issues.

Risk of Electrical Failure:

Subpar PSUs may lack the necessary safety features, increasing the risk of electrical failure or fire. Safety should always be a top priority when selecting a power supply.

Final Thoughts

In conclusion, your 4090’s optimal performance hinges on the power supply unit (PSU). To ensure the best performance, a PSU for a 4090 should be high in wattage, boast excellent efficiency ratings, and offer superior value. Not only does it safeguard your system against voltage fluctuations and power surges, but it also enhances the longevity of your GPU.

Hence, factors such as compatibility, build quality, and warranty must be considered when choosing the ideal PSU for your 4090. Therefore, it is crucial to assess your needs thoroughly, evaluate available options in the market, and make an informed choice to guarantee premium gaming or computing experiences with your 4090.


Why does a 4090 require a high-wattage PSU?

A 4090 requires a high-wattage PSU due to its power-hungry nature, which involves advanced gaming and heavy graphical work.

Does the brand of the PSU matter when using it with a 4090?

Yes, using a reputable brand for your PSU is recommended, as they ensure a stable power supply and often come with better warranties.

Can I use multiple PSUs for my 4090 graphic card?

While technically possible, it’s generally not recommended due to complications arising from synchronizing two power supplies.

Is an 850W PSU enough for the RTX 4090?

An 850W PSU should be sufficient, but if you plan on overclocking or running other high-powered components, you might want something larger, like a 1000W or more.

Do I need specific connectors on my PSU for the RTX 4090?

You’ll need three available eight-pin PCIe power connectors on your PSU to connect an RTX 4090 properly.