We’ve created a detailed guide for everyone interested in Seasonic products or planning to buy a power supply for their PC. You will learn how to choose the right PSU to support the high performance of your home computer, workstation or gaming rig, what product series we offer, what certifications and protection guarantees we provide, and much more. 

What is a Seasonic power supply?

Seasonic PSUs stand out for premium build quality at factories in Taiwan and China, with ISO 9001 and ISO 14001 certification. Our power supply lineup includes the Seasonic PRIME, VERTEX, FOCUS, CORE, and other series, with output power ranging from 300 W to soon up to 3200 W. Power supplies are available in ATX3.1, modular, semi-modular, or fixed cable formats, so everyone can choose the one that best fits their needs and budget. 

The PRIME series power supplies come with a 12-year warranty, full modularity, and top-of-the-line current and voltage regulation characteristics. Seasonic power supplies are guaranteed to output stable power in the long term, which will allow you to run your PC safely at varying levels of load, even during peak load conditions.

All Seasonic models are 80 PLUS® certified (from Bronze to Titanium level). Each power supply has built-in protections, like OCP, OVP, UVP, OPP, OTP, and SCP. These safety features protect the power supply from overheating and damage by keeping the voltage rails under control to make sure they’re stable at all times. 

Seasonic is a brand that provides quality and trust in the world of power supplies for everyone looking for reliability and the highest PC performance. A Seasonic power supply is truly “The Heart of your System.”

Where are Seasonic power supplies used?

You can use our products for many different purposes and various builds, such as:

For the office

Seasonic power supplies ensure reliable daily operation without failures, especially when there are lots of tasks at hand and the PC has to perform them quickly. They ensure quiet operation, which is important for open office setups. During working hours, only mouse clicks and keyboard sounds will be heard. The energy efficiency of our products helps to save on electricity bills, which is also a key point to consider for large offices with dozens of PCs running continuously. 

For gaming

PC gamers have been using Seasonic power supplies for a long time because they are specifically designed to withstand the peak loads of the most modern video cards and processors. Games that utilize cutting-edge graphics technologies, have large and detailed open worlds, or require high resolutions and refresh rates necessitate top-level GPUs and PSUs that provide a stable and dependable supply of power during the most intense fights or other visually appealing renders demanded by “heavy” games. Each Seasonic PSU has good cooling and runs quietly. Use the Seasonic power supply calculator to select a suitable model for potential upgrades or expansions.

For overclocking

Overclockers need reliable power supply units that can handle heavy loads and work as accurately as possible during extreme conditions. Seasonic power supplies do an excellent job of providing a stable power supply with minimal voltage ripple, even when the system works at its limits, and they also have reliable overload protection to ensure the safety of the entire setup. These are all essential Seasonic features when overclocking. With a Seasonic power supply, your system won’t let you down when you’re pushing it hard to its limits. A back-to-back win with a Seasonic-powered setup at the G.SKILL Overclocking World Cup 2025 proves the dependability and effectiveness of Seasonic PSUs during overclocking.

For industrial systems

Seasonic PSUs are greatly suitable for embedded solutions and industrial-grade automation.

There are many industries and applications where our products provide reliability even in extreme conditions, such as high temperature, dust, unstable networks, or institutions where power supplies have to operate continuously 24/7, powering important applications. Each Seasonic PSU is equipped with protections against overheating, overload, or short circuits.

For servers and NAS

Seasonic PSUs are well-designed for continuous operation without interruption, which is very important for servers that continuously perform tasks of data storage and processing. Providing quiet, energy-efficient, and stable power for servers and NAS is very important, especially for home servers.

Bench testing

Testers and reviewers often use Seasonic power supplies to test and evaluate PC hardware because they provide the necessary stable current to power the setup so testers can get the correct readings. A good Seasonic PSU enables testers to precisely analyze hardware, test for functionality, performance, and stability across a range of conditions.

What series of power supplies does Seasonic offer?

The key Seasonic PSU series provides and ensures high-quality operations in your PC and comes with 80 PLUS® certifications (Gold, Platinum, Titanium).

PRIME Series

These premium flagship line units feature ATX 3.1 and PCIe 5.1 standards and are built with maximum efficiency in mind (80 PLUS® Titanium / 80 PLUS®Platinum). PRIME power supplies are fully modular, with ultra-precise voltage stabilization and very quiet cooling. They also come with a 12-year warranty, which brings peace of mind for a long and stable operation for your PC that could run all kinds of tasks, even ones that are highly energy-intensive.   

VERTEX Series

Powerful power supplies with 80 PLUS® Gold and 80 PLUS® Platinum certification and support for ATX 3.1 / PCIe 5.1 standards. They are fully modular and are the perfect choice for professionals and gamers. They come with a 12-year warranty from Seasonic.

FOCUS Series

Mid-range power supplies, built under ATX 3.1 and PCIe 5.1 standards, in black and white chassis colors. These PSUs are fully modular and quiet, which is convenient for offices and home use. FOCUS power supplies are suitable for modern PCs, gaming builds, or standard work PCs. They come with a 10-year warranty.

CORE Series

Aimed at the mass market average users, for office computers, and multimedia applications, these PSUs are available in ATX 3.1 and PCIe 5.1 standards in black and white colors. They have 80 PLUS® Gold certification and are also fully modular. You can conveniently install the necessary components you need using the modular cables. The Seasonic OCRE power supplies stand out in handling basic and usual office setups with high efficiency. The CORE power supplies are protected by a 7-year manufacturer’s warranty.

To sum up all the above:

How do Seasonic’s PSU series differ from one another?

The main difference between the Seasonic PSU series is the level of sophistication and the number of tasks that a PC requires from a power supply unit. The higher the series, the more “comfort” you get in terms of operation and power reserve. But every time, you get the reliability that is characteristic of Seasonic over 50 years.

The PRIME Series is our Flagship and best analog platform with extremely tight voltage regulation and unprecedented reliability. This most renowned Seasonic series on the market is proven right by winning the European Hardware Award (EHA) three years in a row now. The Seasonic PRIME comes with all the bells and whistles. These PSUs are set to work even under very heavy loads and without noise or overheating. A Seasonic PRIME model is highly awarded by testers and reviewers around the world and is the optimal choice for those who want to get the most out of their PC and want to use the best power supply.

The VERTEX Series can be compared to a modern sports car that can handle above-average performance. The VERTEX PSUs can support the operation of top-end assemblies and are provided with special cables that can withstand the power surges of the latest generation of high-end video cards (e.g. RTX 5080). If you are building a high-performance gaming or work PC, and you do not want to worry about your power supply, the VERTEX series will be its proper powerhouse for sure.

The FOCUS Series it’s a compact PSU (only 140 mm deep) and very versatile. It fits almost all cases and is suitable for almost everyone: gamers, office workers, and home users. The Seasonic FOCUS power supplies are extremely popular among a large variety of end-users because they work stably, reliably, quietly, and economically. They are just what you need for your everyday tasks. 

The CORE Series is built for dependable performance for home and office PCs. With support for the latest ATX 3.1 standard, these units deliver stable power and improved efficiency to meet today’s requirements. Designed with a clear focus on quality and reliability, the Seasonic CORE power supplies offer everything you need for a well-balanced system, without unnecessary complexity. If you’re looking for a power supply that’s practical, efficient, and built to last, the CORE Series is a solid choice.

Which Seasonic PSU series is right for gaming, workstations, or servers?

For gaming, you need a stable power supply with a capacity to withstand high loads and high-quality components that ensure quiet operation. To meet these needs, we offer the FOCUS GX ATX 3.1, the VERTEX GX/PX ATX 3.1, and the PRIME PX/TX ATX 3.1 series with power ratings from 650 W up to 1000 W and above.

All these series mentioned above are characterized by long-lasting and stable power output even at peak load situations. Their Hybrid Silent fan Control system (the fan turns on only when necessary) and modular cables (convenient for assembly and great for efficient ventilation) make these units run cool and with the lowest noise output possible. All in all, these Seasonic PSUs answer the needs of modern gamers who want to have the highest level of enjoyment while gaming by providing stable performance and safe operations.

We recommend these same series for workstations (video editing, 3D applications, and AI applications). PRIME is a premium class for your PC, with minimal voltage fluctuations and stable power output. This set of features is especially important for performing tasks that demand reliability and clean power under prolonged high-power circumstances. As Seasonic power supplies tend to have a long life cycle, choosing a Seasonic PRIME, VERTEX, or FOCUS power supply with some wattage buffer will provide enough headroom to easily support potential future hardware upgrades.

The Seasonic FOCUS GX models are the most sought-after power supplies for cost-conscious users who don’t need “everything at once” at the maximum level, but want to own a dependable Seasonic power supply that will power their system for many years to come. The power supplies are of high quality and have proven to be a good workhorse for customers who are looking for the famous Seasonic quality and reliability.

For servers/home servers (NAS), the Seasonic CORE series power supplies are a good choice. They are most often used in home servers because they provide stable and quiet 24/7 operation, with good energy savings and durability. CORE PSUs are often used for HTPC systems as well.

For more complex business servers, or if you need the highest efficiency for cost saving and heat reduction, or continuous operation at full voltage for a long time, the PRIME and VERTEX series models are extremely suitable.

What wattage options does Seasonic offer, and how to choose the right one?

Seasonic PSUs are available in the following power ratings based on usage:

1. High / heavy level: 2200 W (VERTEX, PRIME series), 1600 W, 1300W, 1200 W.
2. Medium / average level: 1000 W (CORE, FOCUS, VERTEX series), 850 W, 750 W.
3. Low / entry level: 650 W (S12III, CORE, B12 series), 550 W, 500 W, 450 W.

Seasonic offers the most comprehensive range of power supplies on the market, spanning from 2200 W and 450 W.

In order to be able to choose the proper power supply that will support the stable operation of your PC and all of its components, we recommend using the Seasonic PSU calculator, which will do the proper power calculation for you. All you need to do is input the power of each component in your system (processor, video card, fans, etc.), and the sum of the power needed to run your components will appear on your screen. 

A nice feature of our calculator is that it adds a 10% – 15% power reserve on top of the calculated wattage requirement. This buffer will ensure that the power supply you choose can withstand peak loads, provide continuous power, and operate just as stably as it should. 

The Seasonic PSU calculator will give various recommendations for PSUs that match your calculated wattage requirement, so you don’t have to search for long to find them yourself. Seasonic PSU calculator is your most reliable assistant when it comes to choosing the most appropriate high-quality power supply for your system.

What is the difference between Titanium, Platinum, and Gold certifications?

Titanium, Platinum, and Gold are different levels of 80 PLUS® certifications that show how efficiently a PSU converts AC electricity to DC output, in other words, what percentage of energy reaches the system and doesn’t become lost as heat.

The table below compares the differences:

The table above shows that the higher the certification, the less electricity is wasted during conversion, therefore the less the system heats up. Efficiency is a good indicator of power supply quality, and it is also a good indicator of long-term cost savings.

Want to delve further into efficiency? Check out the Cybenetics site. While 80 PLUS® focuses purely on efficiency at three load levels, Cybenetics offers a more detailed and comprehensive assessment by testing power supplies across a broader range of loads, using tighter standards,  and closer to real-world conditions. On top of efficiency evaluations, Cybenetics also provides noise ratings, so users can compare not only how efficient a PSU is, but also how quietly it runs, which is especially useful for silent PC builds. If you’re looking for deeper, more technical insight into PSU performance, Cybenetics is a great place to start.

Full- vs semi-modularity in Seasonic PSUs

Sea Sonic builds both modular and semi-modular PSUs for different clients and types of applications. 

Modular PSUs provide the perfect solution for those who want to install only the necessary cables required for powering their PC components. In this way, the inside of the case is kept in order, and there is more room inside for better ventilation. Additionally, modular cables give you the choice to use custom cables that are sleeved with different colors or are customized for SFF cases. When to choose power supplies with fully modular cables? If you want to keep your options open to potential upgrades, or for instance, you have a compact case that could benefit from a larger inner space for better air circulation.

The added advantage of buying a Seasonic power supply with fully modular cables is that you can move from one series to another without having to change. For the PRIME, VERTEX, FOCUS, and CORE model,s we are using the same pinouts on the PSU side, which means that all cables are fully interchangeable. So, for example, if a customer buys a CORE power supply and later decides that the system would need a PRIME, thanks to our uniform pinouts, the replacement of the power supply would take less than 5 minutes before the system is up and running again.

Semi-modular Seasonic power supplies usually have a fixed ATX 24-pin, a fixed CPU, and at least 1 PCIe cable fixed. If you are satisfied with average flexibility for build customization and do not want to incur unnecessary costs when buying a power supply, this option is a good solution for you.

Which Seasonic PSUs offer the best cooling and noise performance?

Seasonic is known to produce excellent power supplies with low noise levels and cloning performance.

PRIME TX‑1600 Noctua Edition

The Seasonic PRIME TX-1600 Noctua Edition power supply boasts a minimum noise level output thanks to the extremely quiet Noctua NF‑A12x25 fan. Not only does this PSU make virtually no noise even under high load, but it is also designed to dissipate heat efficiently and maintain low temperatures at all times.

PRIME TX-1300 ATX 3.1

The PRIME TX-1300 power supply is also a very quiet unit, operating with an average noise output of 11.44dBA (minimum noise output being <6dBA and maximum noise output being 17.7 dBA at 100 %). The Cybenetic noise rating is A++, which is the highest possible mark for PC power supplies today. 

PRIME Titanium 700 W / 600 W Fanless

Built on the basis of passive cooling and efficient heat dissipation, this series is completely fanless and therefore produces zero noise. Being the favorite of many silent PC enthusiasts, these units provide enough power for the average gaming systems or workstations, and thanks to their excellent design, remain only slightly warm after hours of operation under load.

FOCUS GX‑750 ATX 3.1

The FOCUS GX-750 is an excellent power supply built under ATX 3.1 and PCIe 5.1 standards, with an average noise output of merely 27.81 dBA. This number may sound like too high compared to others, but it is still widely considered a quiet environment, a bit similar to a very quiet room with a fan at a low speed or a quiet public library.

What safety protections and certifications do Seasonic PSUs include?

At Seasonic, we provide the following protective features to ensure the safety of your PC:

1. OCP (Over-Current Protection) – shuts down the power supply if the current on any rail exceeds the permissible level.
2. OVP (Over-Voltage Protection) – protects against high voltage, shutting down the system in the event of a sudden surge above the norm.
3. UVP (Under-Voltage Protection) – shuts down the PC if the voltage drops below a critical minimum. 
4. OPP (Over-Power Protection) – activates when the system draws more power than the PSU is rated for.
5. OTP (Over-Temperature Protection) – activates when the PSU is overheating to prevent damage to your PC components.
6. SCP (Short-Circuit Protection) – instant protection against short circuits.
7. SIP (Surge & Inrush Protection) – protection against peak surges when switching on.

Seasonic power supplies have official 80 PLUS® energy efficiency certificates (Titanium, Platinum, and Gold) that testify that the power supply is efficient, reliable, and it complies with important environmental standards. Our ISO certifications guarantee high-quality production and environmental friendliness (ISO 9001, ISO 14001). 

How do you match a Seasonic PSU to your GPU and CPU requirements?

The easiest option is to use our official wattage calculator. To perform this calculation, all you need to do is input the details of your processor model, video card, and the number of drives and fans. As a result, you will receive a recommendation for the minimum PSU power necessary for your build, and you will also receive PSU recommendations that you can read more about on our website. 

It’s recommended in general to add an extra reserve of 10% to 20% to the recommended power value, especially for systems that run powerful GPUs (RTX 4090, RTX 5090, RX 7900 XT). It is good to know that our calculator does create this buffer automatically, so you will not have to worry about not having enough power to safely run your system, as everything will be calculated for you properly by the Seasonic wattage calculator.

Having the right amount of total power for your PC alone doesn’t guarantee the stability of the system at peak loads. Beyond calculating the proper power needs for your system, it is also important to consider the CPU+GPU combination and compare it to the +12V capabilities of the chosen power supply; therefore, it is important to do your research before you commit to buying the right power supply. 

How to choose a Seasonic PSU for your needs? Advice from our experts.

We advise following the step-by-step plan:

1. Determine the required power for your power supply unit. To do this, you can use our online wattage calculator, which takes into account all important components such as the CPU and GPU, plus calculates a safe zone for potential future hardware upgrades.

2. Choose a series that will align with the tasks you plan to do on your PC. The key series at Seasonic are: 

• FOCUS / CORE – for everyday office, gaming, or home systems
• VERTEX – for high-performance systems that demand stable and efficient power
• PRIME – for professional usage, intensive gaming, workstations, and servers. 

      3. Check the consumption on the +12V rails. Make sure that the power supply provides enough current on the +12V line, as this is where the CPU and GPU draw power from. 

      4. Check for certifications and protections:

• Having at least an 80 PLUS® Gold badge will ensure certified energy efficiency and good heat dissipation during operation
• Seasonic guarantees a full set of protections (OCP, OVP, UVP, SCP, etc.) to ensure the safety of the entire system. 

      5. Consider the noise level of the power supply. Semi-passive models (like PRIME and FOCUS) operate silently up to a certain load level and do not generate noise at all. The fully passive PRIME Fanless PSU is best-suited for absolute quiet systems. 

Conclusions

At Seasonic, we offer a complete lineup of power supplies to fit just about any kind of PC, from simple home use to powerful gaming or professional setups. With models that support the latest standards like ATX 3.1 and PCIe 5.1, and a wide range of efficiency levels and wattages, there is certainly something for everyone. No matter what you use your PC for, you will find a reliable, efficient, and long-lasting Seasonic PSU that keeps everything running smoothly, and if you need to reach out to us, our friendly customer service is always ready to support you.