Tested and working HiPro power supply, Model HP-K1603A3. This OEM desktop computer power supply is rated at 157 watts and was commonly used in select HP Pavilion systems. Features standard ATX-style connections and is ideal as a replacement unit for compatible desktop computers. Unit has been tested and functions properly. Please verify compatibility with your system before purchase and review all photos for exact condition and included connectors. The HP-K1603A3 is identified as a 157W power supply in multiple parts databases and reseller listings.