Delta, one of the world's leading companies in energy management and intelligent, environmentally friendly solutions, informs its customers that its redundant high-performance power supplies (19 inches, 1U, 1OU) for AI servers with 5,500 watts are the first in the world to receive the industry's highest energy efficiency certification, 80 PLUS Ruby. This is due to their impressive peak efficiency of up to 97.5 percent and a power factor of 0.99 under full load. Delta leverages its expertise in soft-switching technology and advanced circuit topology, while also utilizing third-generation power semiconductor technology to not only exceed the stringent requirements of 80 PLUS Ruby certification, but also achieve a 59 percent higher power density of 51 watts per cubic inch.

Dong Kai, General Manager of Delta Energy System's Custom Design Business Unit, explains: "Stable and efficient power supplies are core components of AI servers. They play a crucial role in their operation while helping to improve performance and reduce energy consumption. Delta's redundant 5,500-watt high-performance power supplies offer energy efficiency of up to 97.5 percent and are already being used by major global AI companies. This milestone is a testament to Delta's global leadership in energy management and our long-term commitment to innovation with a focus on promoting energy-efficient power supply solutions for the global AI industry."

80 PLUS is a well-known international efficiency standard for power supplies that is significantly higher than most others that apply to many standard power supplies. It requires power supplies to achieve at least 80 percent energy efficiency in various operating phases and is recognized by both the US Environmental Protection Agency's ENERGY STAR energy efficiency standard and EU certification. Over the past 20 years, 80 PLUS has established six certification levels for internal power supply products, with Titanium being the highest. In January 2025, Ruby certification was introduced. In terms of peak power efficiency for redundant power supplies operating at less than 50 percent load, the Titanium standard requires 96 percent, while the Ruby standard requires 96.5 percent and a power factor (PF) of at least 0.96. Ruby has thus replaced Titanium and is now the highest level.

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