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((Short description|Supercomputer built by NEC Corporation))
((More citations needed|date=April 2023))
[[File:NEC SX-9 pic1.jpg|thumb|NEC SX-9, right side]]
[[File:NEC SX-9 pic2.jpg|thumb|NEC SX-9, left side]]
[[File:Earth simulator ES2.jpg|thumb|NEC SX-9 [[Earth Simulator]]]]
[[File:NEC SX-9 CPU modules PB111972.jpg|thumb|NEC SX-9 CPU modules]]
[[File:NEC SX-9 RTR module PB111974.jpg|thumb|NEC SX-9 memory module]]
The '''SX-9''' is a [[NEC SX]] supercomputer built by [[NEC Corporation]].  The SX-9 Series implements an [[Symmetric multiprocessing|SMP]] system in a compact node module and uses an enhanced version of the single chip vector processor that was introduced with the [[NEC SX-6|SX-6]].  The NEC SX-9 processors run at 3.2 [[Gigahertz|GHz]], with eight-way replicated vector pipes, each having two multiply units and two addition units; this results in a peak vector performance of 102.4 [[FLOPS|gigaFLOPS]].  For non-vectorized code, there is a scalar processor that runs at half the speed of the vector unit, i.e. 1.6&nbsp;GHz.  Up to 16 CPUs and 1 [[terabyte]] of memory may be used in a single node. Each node is packaged in an air-cooled cabinet, similar in size to a standard 42U computer rack. The SX-9 series ranges from the single-node SX-9/B system with 4 CPUs to the maximum expansion stage with 512 nodes, 8,192 CPUs, and 970 TFLOPS peak performance. There is up to 4 TB/s shared memory bandwidth per node and 2×128 GB/s node interconnect bandwidth. The operating system is NEC's [[SUPER-UX]], a [[Unix-like]] OS.

The SX-9 had the world's fastest vector CPU core.<ref>((Cite book|doi = 10.1109/IPDPS.2009.5161089|chapter = The world's fastest CPU and SMP node: Some performance results from the NEC SX-9|title = 2009 IEEE International Symposium on Parallel & Distributed Processing|pages = 1–8|year = 2009|last1 = Zeiser|first1 = Thomas|last2 = Hager|first2 = Georg|last3 = Wellein|first3 = Gerhard|isbn = 978-1-4244-3751-1|s2cid = 8447987))</ref><ref>((Cite web|url=http://insidehpc.com/2008/11/12/nec-sx-9-and-the-hpc-challenge-a-fairy-tale-story/|title = NEC SX-9 and the HPC Challenge: A Fairy Tale Story|date = 12 November 2008))</ref> A fully equipped system with 512 nodes would have been the world's fastest supercomputer at the time of release in the first quarter of 2008, with a performance of 819 TFLOPS. The SX-9 was discontinued in 2015.<ref>((Cite web|url=https://jpn.nec.com/hpc/sx9/|title = Sx-9: Hpcソリューション &#124; Nec))</ref>

The German national meteorological service ([[DWD]]) operated two independent SX-9 clusters, with 976 processors, 31,232 GB of [[RAM]] and 98 TFLOPS performance in total.<ref>((Cite web |url=http://www.dwd.de/bvbw/generator/DWDWWW/Content/Presse/Pressekonferenzen/2009/PK__17__03__09/20090317__ZundF__Rechner,templateId=raw,property=publicationFile.pdf/20090317_ZundF_Rechner.pdf |title=Archived copy |access-date=2010-10-15 |archive-date=2015-09-23 |archive-url=https://web.archive.org/web/20150923230433/http://www.dwd.de/bvbw/generator/DWDWWW/Content/Presse/Pressekonferenzen/2009/PK__17__03__09/20090317__ZundF__Rechner,templateId=raw,property=publicationFile.pdf/20090317_ZundF_Rechner.pdf |url-status=dead ))</ref>

==NEC Published Product Highlights==
*1.6 TFLOPS max. peak performance per node
*350 million transistors per CPU, 1.0 V, 8,960 pins (1,791 signal pins)<ref name="NEC-080405">[http://www.nec.com/en/global/techrep/journal/g08/n04/pdf/080405.pdf ''LSI and Circuit Technologies of the SX-9''] TANAHASHI Toshio, TSUCHIDA Junichi, MATSUZAWA Hajime, NIWA Kenji, SATOH Tatsuo, KATAGIRI Masaru, NEC TECHNICAL JOURNAL, Vol.3, No.4, 2008</ref>
*Up to 16 CPUs per node, manufactured in 65&nbsp;nm CMOS cu technology, 11 copper layers
*Up to 64 GB of memory per CPU, 1 TB in a single node
*Up to 4 TB/s bandwidth per node, 256 GB/s per CPU
*IXS Super-Switch between nodes, up to 512 nodes supported, 256 GB/s per node (128 GB/s for each direction)
*50% less power consumption compared to the NEC SX-8R

==See also==
*[[SUPER-UX]]
*[[SX architecture]]

==External links==
*[http://www.nec.co.jp/techrep/en/journal/g08/n04/g0804mo.html#name3-0 special issue of NEC Technical Journal (Vol 3, No 4, 2008) on NEC SX-9]

==References==
((Reflist))

((NEC supercomputers))

((DEFAULTSORT:Nec Sx-9))
[[Category:NEC supercomputers|Sx-9]]
[[Category:Vector supercomputers]]

[[ja:NEC SX#SX-9]]

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