The Cray XC40 is a massively parallel multiprocessor supercomputer manufactured by Cray. It consists of Intel Haswell Xeon processors, with optional Nvidia Tesla or Intel Xeon Phi accelerators, connected together by Cray's proprietary "Aries" interconnect, stored in air-cooled or liquid-cooled cabinets. The XC series supercomputers are available with the Cray DataWarp applications I/O accelerator technology.
- The Pawsey Supercomputing Centre has a 35,712-core XC40 called "Magnus" for general science research. This supercomputer has a processing power of 1.097 petaflops.
- The Bureau of Meteorology has a 51,840 core XC40 called "Australis" with 276TB of RAM and a usable storage of 4.3PB. The supercomputer with a peak performance of 1.6 petaflops provides the operational computing capability for weather, climate, ocean and wave numerical prediction and simulation .
- National IT center for science CSC computer "Sisu" was completed as XC40 in 2014. It has 40,512 cores with overall peak performance of 1,688 TFlops.
- High Performance Computing Center, Stuttgart (HLRS) has built a 185,088-core XC40 named "Hazel Hen" with a peak performance of 7420 TFlops.
- Supercomputer Education and Research Centre (SERC) at the Indian Institute of Science has an XC40 supercomputer named SahasraT, with 1,376 compute nodes (33,024 Intel Haswell Xeon cores), together with Intel Xeon Phi and NVIDIA K40 GPU accelerators.
- Pratyush and Mihir are the supercomputers established at Indian Institute of Tropical Meteorology (IITM), Pune and National Center for Medium Range Weather Forecast (NCMRWF) respectively.Pratyush and Mihir are two High Performance Computing (HPC) units. They are located at two government institutes,one being 4.0 PetaFlops unit at IITM, Pune and another 2.8 PetaFlops unit at the National Centre for Medium Range Weather Forecasting (NCMRWF), Noida. Both units and provides a combined output of 6.8 PetaFlops.
- Interdisciplinary Centre for Mathematical and Computational Modelling in Warsaw has an XC40 supercomputer named Okeanos with 1084 compute nodes (26016 Intel Xeon cores) with 128 GB of RAM each. 
- King Abdullah University of Science and Technology (KAUST) has an XC40 named Shaheen. The processing power is 5.54 petaflops with 196,608 cores.
- The Swiss National Supercomputing Centre in Lugano had a system in 2013 named Piz Dora, a Cray XC40 with 1256 compute nodes. This has been combined with the old Piz Daint system into the new Cray XC50 Piz Daint.
- The UK Met Office has a 240,000 core XC40, capable of 8 petaflops peak. It is currently the fastest machine in the world dedicated to weather and climate modelling, and was the 11th fastest on the TOP500 list when it was installed in June 2017.
- The United States Army Research Laboratory has an XC40 supercomputer called "Excalibur".   This computer has 100,064 cores.
- The Lawrence Berkeley National Laboratory has a XC40 supercomputer called "Cori" with 76,416 Intel Haswell cores and 658,784 Xeon Phi Knights Landing cores.
- Petroleum Geo-Services has an XC40 supercomputer used for the processing of complex seismic data sets.
- XC40 Brochure 2014.
- Pawsey Magnus web page 2015.
- "CSC's Servers - Sisu: Cray XC40 Supercomputer". CSC - IT Center for Science Ltd. Retrieved 27 September 2015.
- "Cray XC40 Hazel Hen". HLRS. 2015-12-09. Retrieved 2015-12-19.
- "Archived copy". Archived from the original on 2015-06-15. Retrieved 2015-06-13.
- Feldman, Michael (4 June 2018). "World's Most Powerful Supercomputer for Astronomy Begins Operation". Top 500. Retrieved 25 June 2018.
- "Okeanos - Centrum Obliczeniowe, ICM Uniwersytet Warszawski". www.icm.edu.pl (in Polish). Retrieved 2017-02-06.
- KAUST Shaheen II Announcement 2014.
- Beskow Hardware 2015.
- CSCS: Piz Daint & Piz Dora
- Feldman, Michael. "TOP500 Meanderings: Supercomputers for Weather Forecasting Have Come a Long Way | TOP500 Supercomputer Sites". www.top500.org. Retrieved 11 July 2018.
- "United Kingdom Meteorological Office | TOP500 Supercomputer Sites". www.top500.org.
- Top500 Excalibur 2014.
- ARL DSRC Hardware web page 2015.
- "Cori Phase I Configuration". Retrieved 18 May 2017.
- "Cray XC40 Brochure" (PDF). Cray Inc. Retrieved 28 October 2014.
- "Cray XC Series Technology". Cray Inc. Retrieved 28 October 2014.
- "Cray XC40 Specifications". Cray Inc. Retrieved 28 October 2014.
- "Excalibur - Cray XC40". Top500.org. Retrieved 24 November 2014.
- "ARL DSRC Hardware". U.S. Army Research Laboratory. Retrieved 17 May 2016.
- "HLRS Hornet". HLRS. Retrieved 11 Nov 2014.
- "KAUST Makes Strategic Investment in Supercomputing to Advance Scientific Discovery". King Abdullah University of Science and Technology. Retrieved 20 January 2015.
- "Beskow Hardware - PDC". KTH Royal Institute of Technology. Retrieved 24 September 2015.
- "Pawsey Magnus". Pawsey Supercomputing Centre. Retrieved 27 May 2015.
- Webb, Jonathan (28 October 2014). "Met Office to build £97m supercomputer". BBC. Retrieved 24 November 2014.
- "PGS Employs Cray Supercomputer for High-Resolution Imaging". PGS. 25 March 2015.
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