IBM 03N6793 server / storage / networking hardware Server Hardware / Parts

The IBM 03N6793 is a 1.3V Voltage Regulator Module (VRM), rated at 105A and built around the AcBel API4VR12-031G design. VRMs like this one sit between a server’s main power supply and its processors, converting the higher input rail down to the precise low voltage the CPU needs and holding that output stable under changing load. This specific module is used in IBM’s 9110-510/9110-51A pSeries systems and IBM xSeries 346 rack servers, both of which use VRM daughtercards of this type to regulate processor power on a per-socket basis rather than relying on the main PSU alone. A failed VRM typically shows up as processor instability, failed POST, or a CPU that will not power on while the rest of the system remains healthy, so replacement is usually a straightforward like-for-like swap once the host platform is confirmed. Tech-Star supplies the 03N6793 as a refurbished module for exactly this kind of repair; the company is UK-based and ships worldwide.