Genuine internal power supply 550W from HP, designed for HP Elite Tower desktops and compatible HP workstation platforms. This power supply provides a total power of 550W, with efficiency up to 92%, active power factor correction (PFC), and 5 12V rails for stable power delivery. It is designed for specific HP Elite Tower configurations, such as the HP Elite Tower 800 G9 Desktop PC, HP Z1 G9 Tower, and HP Z2 G9 SFF Workstations, especially for demanding builds requiring a 550W chassis. The genuine HP replacement part is recognized by the MPN code M86264-001 and is an internal power supply for business tower desktops and SFF systems.