Seasonic PRIME Enterprise RX 1600 Becomes First 115 V ATX PSU to Earn 80 PLUS Ruby

Seasonic has reached a major power supply efficiency milestone with the PRIME Enterprise RX 1600, becoming the first manufacturer to earn 80 PLUS Ruby certification for an ATX power supply tested at 115 V. Announced on August 18, 2026, the 1600 W platform is designed for demanding desktop systems, professional workstations and AI focused configurations where both sustained power delivery and efficiency are becoming increasingly important. Seasonic says Ruby represents the most demanding efficiency level currently available within the 80 PLUS certification program.

Unlike previous efficiency tiers that concentrate heavily on medium and high system loads, 80 PLUS Ruby introduces significantly stronger requirements at low utilization. A 115 V power supply must reach 85% efficiency at 5% load, 91% at 10%, 93% at 20%, 95% at 50% and 91% at 100% load. It must also maintain a power factor of at least 0.95 at 20% load. This makes the certification particularly relevant for modern high performance systems that may contain extremely powerful CPUs and GPUs but still spend substantial periods operating close to idle.

"Reaching Ruby at 115 V reflects the continued focus on efficiency in our engineering work. We are at a point where every additional percent of efficiency is difficult to achieve, but the effort is worthwhile because these small gains translate into enormous savings on a global scale."
— Quote by: Walter Sun, CEO of Sea Sonic

Seasonic says reaching Ruby required optimization across switching control, component selection, thermal design and validation. Improving efficiency reduces the amount of electrical power converted into heat, which can lower cooling requirements and energy consumption. Those benefits become increasingly important in professional workstations and AI systems that may operate continuously while experiencing rapid and substantial changes in power demand.

The PRIME Enterprise RX 1600 also continues a long history between Seasonic and the 80 PLUS program. The company became the first manufacturer to certify a PC power supply under the program at 115 V in 2005 with the SS 400HT and became the first to reach 80 PLUS Gold in 2008. The new RX 1600 adds the first 115 V Ruby certification in 2026.

"Ruby sets a new standard for what high performance power supplies can achieve, including efficiency at low load, which is where most systems spend the majority of their time."
— Quote by: Jeremy Townsend, Senior Vice President, Delivery Services at CLEAResult

The milestone arrives as power supply manufacturers move toward increasingly powerful designs for AI workstations and extreme GPU configurations. Products such as the Super Flower Leadex 2800 W Titanium demonstrate how workstation class systems are pushing PSU output considerably beyond conventional gaming requirements, while Seasonic is using the PRIME Enterprise RX 1600 to push efficiency standards at the same time.

Seasonic has not announced pricing or broad retail availability for the PRIME Enterprise RX 1600. The Ruby certification itself also evaluates power conversion efficiency rather than acting as a complete measurement of voltage regulation, acoustics, transient response or long term electrical performance, meaning independent testing will still be important once the product reaches the market.

The most interesting part of 80 PLUS Ruby is not the 95% efficiency target at 50% load. Premium power supplies have already become extremely efficient around their optimal operating range. The bigger advancement is forcing manufacturers to demonstrate strong efficiency at 5% and 10% loads, where powerful gaming PCs and workstations can spend a surprising amount of time when they are not actively rendering, gaming or running AI workloads.

A 1600 W PSU is excessive for most gaming PCs, but workstation and local AI configurations are rapidly changing what high end desktop power delivery looks like. Seasonic becoming the first company to pass the new Ruby requirements at 115 V establishes another efficiency benchmark just as high wattage PSU development begins accelerating.

Would 80 PLUS Ruby certification influence your next PSU purchase, or do factors such as electrical performance, warranty, acoustics and price matter more than another efficiency tier?