PC Power Supplies

How do I choose the right PC power supply wattage for my build?

To choose a PSU with the right power capacity, first, you should consider peak power loads from your PC components during heavy workloads. The most power-hungry components are always the GPU and CPU, so start the calculation with them. Then add power requirements from a motherboard, RAM, SSDs, cooling system, and add an extra 20-30% of headroom for the system to work stably under power spikes. Calculate them together and use the final figure as a standard number for choosing a PSU with an appropriate power range.

To make this process easier, use an online wattage calculator where the system does all the math by itself. 

What is the difference between PRIME, VERTEX, FOCUS, CORE, G12, and B12 Series power supplies?

Seasonic PRIME PSUs are the best in the whole lineup as they combine the latest innovations and smart technologies to support high-end systems and modern hardware.  

Seasonic PRIME is a flagship PSU series, designed for high-end gaming, workstations, and professional builds. They backed up with 80 PLUS® Titanium and Platinum certifications, support ATX 3.1 standard, and come with native 12V-2×6 cable to support RTX 50 Series GPUs.

Seasonic VERTEX PSUs are almost aligned with PRIME technical specifications, but are more accessible due to their price. They also support the ATX 3.1 standard, have a native 12V-2×6 cable for RTX 40/50 Series GPUs.

Seasonic FOCUS PSUs are smaller, more affordable, and typically come with 80 PLUS Gold certification. The new FOCUS GX ATX 3.1 series supports modern GPUs and includes fully modular cables.

Seasonic CORE PSU series is a more affordable series for mid-range systems. It offers fewer features and a shorter warranty than the FOCUS, usually comes with a semi-modular or fixed-cable design, and is built for standard gaming systems without extreme workloads.

Seasonic G12 PSUs are a budget line for basic gaming and office systems. It has a way simpler design and is generally not geared toward high-end GPUs or ATX 3.1 features. 

The Seasonic B12 is one of the brand’s most affordable series for entry-level systems. It is designed for basic builds without heavy loads and without the premium PRIME/VERTEX features. 

Which Seasonic PC power supplies support ATX 3.1 and PCIe 5.1?

ATX 3.1 and PCIe 5.1 standards support the following Seasonic PSU models:

1. Seasonic PRIME TX ATX 3.1.
2. Seasonic PRIME PX ATX 3.1.
3. Seasonic VERTEX GX / PX ATX 3.1.
4. Seasonic FOCUS GX ATX 3.1. 
5. Seasonic CORE GX / GC ATX 3.1.

Are all Seasonic PC power supplies fully modular?

The Seasonic PSU modularity depends on its series and the model. For example, the PRIME and VERTEX series are mostly fully modular, while the FOCUS series can be either fully modular or semi-modular depending on the version. The CORE and budget series, on the other hand, typically use simpler or partially fixed cabling designs.

What efficiency certifications are available across Seasonic PC power supplies?

For the latest high-end models (like PRIME and VERTEX), the common efficiency ratings are 80 PLUS® Titanium, Platinum, and Gold. Budget-oriented series typically come with 80 PLUS® Bronze or Gold certifications.