Cray XC40 (Hazel Hen)

Supercomputer Hazel Hen, a Cray XC40-system, is at the heart of the high performance computing (HPC) system infrastructure of the HLRS. With a peak performance of 7.42 Petaflops (quadrillion floating point operations per second), Hazel Hen is one of the most powerful HPC systems in the world (position 8 of TOP500, 11/2015) and is the fastest supercomputer in the European Union. The HLRS supercomputer, which was taken into operation in October 2015, is based on the Intel® Haswell Processor and the Cray Aries network and is designed for sustained application performance and high scalability.

Technical Description

Peak performance7420 TFlops



41 Cabinets a 1.5 t = 61.5 t

Number of compute nodes7712
Number of compute coresper node 2 sockets each with 12 cores (185,088)
Number of service nodes90
Processor compute nodesIntel® Xeon® CPU E5-2680 v3 (30M Cache, 2.50 GHz)
Memory/node128 GB
Disk capacity ~10 PB
Node-node interconnectAries
Special nodesExternal Access Nodes, Pre & Postprocessing Nodes, Remote Visualization Nodes
Power consumption ~3200 KW