The primary mission of the High Performance Computing Service (HPCS) is the delivery and support of a large HPC resource for use by the University of Cambridge research community. The principal facilities consist of a large CPU compute cluster (Darwin) and a world-leading energy efficient GPU compute cluster (Wilkes). We welcome users from all disciplines within the University and of all levels of experience. The HPCS also provides one component of the DiRAC distributed supercomputing facility funded by STFC.