PRIME Series

Overview of the Seasonic PRIME Line

Why PRIME Is Our Flagship

PRIME series is Seasonic’s flagship product, combining the highest quality, efficiency, and technical excellence. 

It was created in response to the need for reliable, powerful, and durable power supplies. The PRIME series includes models with 80 PLUS® Titanium, Platinum, and Gold certification. These guarantees up to 94% efficiency and stable system operation even under heavy loads. 

All models in the series are fully modular, have minimal voltage ripple, long hold-up time, and a full set of protections – OPP, OVP, UVP, SCP, etc. Some models are completely silent in Fanless mode or are very quiet thanks to hybrid cooling. 

We are particularly proud of the latest PRIME TX-1600 Noctua Edition PSU, created in collaboration with Noctua. The jointly developed power supply combines flawless performance and ultra-quiet operation thanks to a premium fan from Noctua. 

The internal design of the PRIME PSU series is distinguished by the absence of wires, which increases reliability and build quality. In addition, Seasonic provides up to 12 years of warranty. It’s the reliable proof of the absolute confidence in the high performance of every PSU from Seasonic. 

That is why the PRIME series remains the benchmark among power supplies for enthusiasts, gamers, and professionals all around the world.

Key Upgrades in 2025 (ATX 3.1 & PCIe 5.1 readiness)

In 2025, Seasonic significantly updated its flagship PRIME TX ATX 3.1 series. The core mission of the changes was to meet the new ATX 3.1 and PCIe 5.1 standards. These updates are based on the flagship PRIME TX platform with added new technologies and hardware changes. Updates include the following options:

1. Native 12V-2×6 (16-pin) connectors that comply with the PCIe 5.1 specification instead of the old 12VHPWR cables.
2. Improved voltage stability with regulation within less than 0.5% thanks to Micro Tolerance Load Regulation technology.
3. Use of Japanese capacitors with thermal stability up to 105°C and digital fan control, for long-lasting and quiet operation.

The new models were released right away in China. In other regions –  from the beginning of 2025.

TX vs PX vs GX – Which One Fits Your Build?

Efficiency Tier (Titanium / Platinum / Gold)

80 PLUS® certification is an energy efficiency standard for computer power supplies. Having this label means they’re efficient at converting electric current from the mains into direct current. 

Here are the core 80 PLUS® certifications Seasonic offers:

1. 80 PLUS® Titanium: minimum 90% efficiency at 20% load; 94% at 50% and 90% at 100%.
2. 80 PLUS® Platinum: minimum 89% efficiency at 20% load; 92% at 50% and 89% at 100%.
3. 80 PLUS® Gold: minimum 87% efficiency at 20% load; 90% at 50% and 87% at 100%.

For today, Seasonic offers a wide range of power supplies with different certification levels. The various options allow users to choose the best PSU to handle even the most power-consuming tasks. Like these ones:

1. Seasonic PRIME Ultra is a top-of-the-line series with maximum efficiency and 80 PLUS® Titanium certification. It provides extremely stable operation with minimal energy loss. 
2. Seasonic PRIME Plus is are reliable power supplies with 80 PLUS® Platinum certification, which guarantee high energy efficiency and a long lifespan.
3. Seasonic PRIME Gold is a series that combines high efficiency (80 PLUS® Gold) with reliability and quiet operation. Perfect choice for users who value a balance between price and quality. 

Voltage Regulation & Ripple Figures

Seasonic PRIME TX, PRIME PX, and PRIME GX series power supplies are renowned by their extremely high voltage regulation stability. Their deviation on the +12 V line usually does not exceed ±0.5%. This ensures the stable and reliable operation of computer systems even under high loads. 

The ripple level in these PSUs is significantly lower than the established standards: 

• on the 12 V line, it’s up to 16.54 mV, 
• on the 5 V line – up to 6.52 mV, 
• on the 3.3 V line – up to 11.49 mV, 
• on the 5VSB line – up to 9.72 mV. 

They’re great for high-performance systems because they have precision voltage regulation and minimal ripple. Especially for those where power, stability, and reliability make sense the most.

Target Use-Cases (Overclocking, Silence, Budget)

For overclocking, we recommend choosing the PRIME TX PSU series. They are 80 PLUS® Titanium certified, which means they ensure high productivity of up to 94% under 50% load. They are equipped with high-quality Japanese capacitors and fully modular cables. In complex, these features make them ideal for systems with high power consumption, especially for overclocking.

For super silent operations, the PRIME PX PSU series could be a smart choice. This line achieves 80 PLUS® Platinum certification with up to 92% efficiency at 50% load. It’s also equipped with digital fan control and Japanese capacitors, which provide stable power and keep noise levels low. All these features make it suitable for builds where quiet operation is an important factor.

In terms of budget, choose the FOCUS GX PSUs Series. They are 80 PLUS® Gold certified with up to 90% efficiency at 50% load. It offers high quality at an affordable price, so it’s the perfect power supply for those on a budget.

Fanless vs Active Cooling Options for PRIME Series

Hybrid Fan Control Curve Explained

Hybrid fan control is an innovative technology from Seasonic. Its essence is that it optimizes the balance between effective cooling and low noise levels in power supplies. It operates in three modes: 

1. Fanless Mode. The fan doesn’t operate at loads up to 30–40% (approximately 300–400 W).
2. Silent Mode. The fan operates at low speeds, providing effective cooling at moderate loads.
3. Cooling Mode. The fan runs at high speed under high load, providing maximum cooling.

This technology significantly reduces noise levels when the computer is idle or under light load. This hybrid fan control from Seasonic gives you the best of both worlds when it comes to quietness and cooling efficiency.

How Fanless PRIME Series Maintains Thermal Headroom

Seasonic PRIME Fanless series power supplies provide efficient passive cooling without the use of fans. This technology lets you keep thermal headroom even under high loads.

How does PRIME Fanless Series maintain thermal headroom?

1. Passive cooling: The absence of a fan reduces energy consumption and noise levels. At the same time, effective heat dissipation is maintained through specially designed radiators and case design.
2. High efficiency: PRIME Titanium Fanless models achieve 80 PLUS® Titanium certification. Which means up to 94% efficiency under 50% load. This reduces heat dissipation and increases operational stability.
3. High-quality components: High-quality Japanese solid-state capacitors guarantee durability and reliability.
4. Thermal reserve: Even under prolonged load, the power supplies remain only slightly warm, indicating effective thermal management.

Thanks to these characteristics, PRIME Fanless series PSUs are definitely the way to go for creating silent and powerful computer systems.

Core Technologies Inside PRIME

Full-Bridge LLC & DC-to-DC Topology

At Seasonic, we use Full-Bridge LLC topology in our prime, high-performance power supplies. It is particularly effective in the PRIME PSU series. Supporting 80 PLUS® Platinum and Titanium certifications.

The work principle is as follows. On the primary side (input), we use a Full-Bridge + LLC-resonant circuit. It provides soft switching and high efficiency while reducing heat loss. 

On the secondary side, we use synchronous rectifiers (for +12 V rails) and DC-DC converters for 5 V and 3.3 V lines. This helps save more energy and keeps the output voltage more stable.

Thus, the Full-Bridge LLC topology in Seasonic’s premium PC power supplies helps achieve maximum efficiency, stability, and effective thermal management. Secondary DC-DC converters help keep the voltage steady, and the vertical layout makes the system quieter and easier to use for every PC enthusiast.

12-Year Warranty and Premium Japanese Capacitors

Seasonic’s PRIME Series PSUs have received an industry-standard 12-year manufacturer’s warranty. One of the longest on the market for power supplies. It is provided reflectively for all PRIME models. This way, we show the confidence in our product’s quality and highly effective performance under different loads, including the highest ones. 

At Seasonic, we are committed to superior build quality. All PRIME models are equipped with canonical Japanese Nippon Chemi-Con capacitors (KZE, KZH, YXD, 105°C versions). This component guarantees a lot of advantages and improvements. Like high thermal stability, voltage stability, and minimal ripple even during prolonged and intensive use. 

This combination ensures the highest level of reliability, efficiency, and durability. Which is important for high-performance, gaming, or work systems.

Connector Set: 12V-2×6, Dual EPS, SATA/Molex

The Seasonic PRIME series is equipped with PSUs that support 12V-2×6 connectors, comply with ATX 3.0 and PCIe 5.1 standards. They directly provide up to 600W of power to handle modern graphics cards’ operations and other “heavy” PC tasks.

These cables are primarily designed for high-performance PCs, including gaming and professional systems. They are suitable for Seasonic PRIME TX, PX, VERTEX GX, and FOCUS GX models with a power rating of 650W and above. 

For safe use, both 12V-2×6 cable connectors must be fully connected to the power supply. We recommend checking that they are securely connected so that the current flows directly through the cables to your PC. They’re also backward compatible with the previous 12VHPWR standard, so they can be used with it.

Build Examples & Compatibility

High-End Gaming PC (< 1 kW)

At Seasonic, we recommend choosing the following PSUs models for building a highly productive gaming PC (< 1kW). All of them meet modern standards and ensure reliability and efficiency altogether.

1. Seasonic PRIME TX-1000 model (80 PLUS® Titanium),
2. Seasonic VERTEX GX-1000 model (80 PLUS® Gold),
3. Seasonic FOCUS GX-1000 model (80 PLUS® Gold).

They are fully modular, support 12 and 10-year warranty from Seasonic, quiet, and equipped with premium Japanese capacitors.

A quick tip from Seasonic experts. Use a PSU with a capacity of at least 1000 W if you’re using high-power processors or GPUs. Like, NVIDIA RTX 4080/4090. This power reserve will ensure stable system operation. 

Silent Workstation (Fanless 700 W)

To create a silent workstation with up to 700W of power, Seasonic offers the PRIME FANLESS TX-700 model. This is a high-quality fanless power supply, ideal for those who value absolute silence while working.

Key features of the Seasonic PRIME FANLESS TX-700:

1. Supports 80 PLUS® Titanium certification. 
2. Have fully modular cables. 
3. High-quality Japanese capacitors are among the components. 
4. Micro-accurate load regulation. 
5. Supports a 12-year warranty from Seasonic. 

Dual-GPU AI Rig (1.6–2.2 kW)

To create a powerful AI workstation with dual GPUs, you need to choose a PSU that can provide stable and reliable power. At Seasonic, we offer several models that meet these requirements. Like the following ones. 

Seasonic PRIME TX-1600 (80 PLUS® Titanium)

This model comes with fully removable cables and uses top-quality Japanese capacitors. It makes it possible to add other components using case space and improve airflow there. It supports ATX 3.0 and PCIe 5.1 standards, making it compatible with the latest GPUs. It supports two RTX 5090-class graphics cards with a peak consumption of 575W each.

Seasonic PRIME PX-1600 (80 PLUS® Platinum)

It also supports ATX 3.0 and PCIe 5.1 standards and has full cable modularity. The PSU can run two high-end graphics cards with stable operation.

The Seasonic models presented above meet high standards of efficiency and quality. Their technical characteristics make them an excellent choice for powerful systems with two GPUs. They provide stable operation, PC longevity, and high productivity while handling even the heaviest tasks.