Cray XC40 (Hazel Hen)

Supercomputer Hazel Hen, a Cray XC40 system, is at the heart of the high performance computing (HPC) system infrastructure at 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 17 in the TOP500, June 2017) and is the fastest supercomputer in Germany. Hazel Hen entered operation in October 2015, is based on the Intel® Haswell Processor and the Cray Aries network technologies, 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