The HP 643956-101 is a robust 1200W Power Supply Unit delivering Platinum-grade efficiency for HP's Generation 8 and Generation 9 (G8/G9) servers. This high-capacity PSU is designed to meet the demanding power requirements of high-end server configurations, including those with multiple processors, large memory setups, and extensive storage solutions. With an efficiency rating of up to 94%, it minimizes power waste and supports HP's efforts to create environmentally sustainable server solutions. The PSU's compatibility with both G8 and G9 servers adds versatility, ensuring it meets the needs of a diverse array of system architectures. It features hot-swappable functionality, enabling seamless maintenance and upgrades without the need to power down critical systems, thereby ensuring uninterrupted operations.