Base Unit
(Decommissioned: September 2011)

• Manufacturer: Linux Networx/SuperMicro
• 3.33 Tflop/s
• 520 Total Cores
• 2 dual-core processors per node
• 4 GB of memory per node
• 3.2 GHz Intel Xeon Dempsey (2 flop/s per clock)
• Interconnect: Infiniband DDR
• Production: 4Q 2006

Discover Scalable Units 1 and 2
(Decommissioned: 2015)

• Linux Networx/Dell Custom Supersystem
• 516 nodes (dual socket, dual core)
• 2,064 Intel Xeon Woodcrest (2.66 GHz) processor cores
• 1 gigabyte per core (4 gigabytes per node) = 2.064 terabytes of memory
• 20 gigabit-per-second InfiniBand DDR network
• 21.96 teraflops peak
• Production: 2 & 3Q 2007

Discover Scalable Units 3 and 4
(Decommissioned: 2015)

• IBM iDataPlex
• 516 nodes (dual socket, quad core)
• 4,128 Intel Xeon Harpertown (2.5 GHz) processor cores
• 2 gigabytes per core (16 gigabytes per node) = 8.256 terabytes of memory
• 20 gigabit-per-second InfiniBand DDR network
• 41.28 teraflops peak
• Production: 3 & 4Q 2008

Scalable Unit 1+
(Decommissioned: February 2015)

• Manufacturer: IBM
• 34.7 Tflop/s
• 3,096 Total Cores
• IBM iDataPlex Compute Nodes
• 2 hex-core processors per node
• 24 GB of memory per node
• 2.8 GHz Intel Xeon Westmere (X5660)
• Interconnect: Infiniband DDR
• Upgraded: 4Q 2011

Scalable Unit 2+
(Decommissioned: February 2015)

• Manufacturer: IBM
• 34.7 Tflop/s
• 3,096 Total Cores
• IBM iDataPlex Compute Nodes
• 2 hex-core processors per node
• 24 GB of memory per node
• 2.8 GHz Intel Xeon Westmere (X5660)
• Interconnect: Infiniband DDR
• Upgraded: 4Q 2011

Scalable Unit 3+
(Decommissioned: January 2015)

• Manufacturer: IBM
• 34.7 Tflop/s
• 3096 Total Cores
• IBM iDataPlex Compute Nodes
• 2 hex-core processors per node
• 24 GB of memory per node
• 2.8 GHz Intel Xeon Westmere (X5660)
• Interconnect: Infiniband DDR
• Upgraded: 3Q 2011

Scalable Unit 4+
(Decommissioned: January 2015)

• Manufacturer: IBM
• 34.7 Tflop/s
• 3096 Total Cores
• IBM iDataPlex Compute Nodes
• 2 hex-core processors per node
• 24 GB of memory per node
• 2.8 GHz Intel Xeon Westmere (X5660)
• Interconnect: Infiniband DDR
• Upgraded: 3Q 2011

Scalable Unit 12
(Decommissioned: Oct 2020)

• Manufacturer: SGI
• 683 Tflop/s
• 17,136 Intel Xeon Haswell processor cores
• SGI C2112 Compute Nodes
• 2 14-core processors per node
• 128 GB of memory per node
• No Swap Space
• 2.6 GHz Intel Xeon Haswell
• Interconnect: Infiniband FDR
• Production: 2Q 2015

Scalable Unit 5
(Decommissioned: June 2013)

• Manufacturer: IBM
• 46.23 Tflop/s
• 4,128 Total Cores
• IBM iDataPlex Compute Nodes
• 2 quad-core processors per node
• 24 GB of memory per node
• 2.8 GHz Intel Xeon Nehalem (4 flop/s per clock)
• Interconnect: Infiniband DDR
• Production: 3Q 2009

Scalable Unit 6
(Decommissioned: June 2013)

• Manufacturer: IBM
• 46.23 Tflop/s
• 4,128 Total Cores
• IBM iDataPlex Compute Nodes
• 2 quad-core processors per node
• 24 GB of memory per node
• 2.8 GHz Intel Xeon Nehalem (4 flop/s per clock)
• Interconnect: Infiniband DDR
• Production: 1Q 2010

Scalable Unit 7
(Decommissioned October 2014)

• Manufacturer: Dell
• 161.3 Tflop/s
• 14,400 Total Cores
• Dell C6100 Compute Nodes (1200 nodes)
• 2 hex-core processors per node
• 24 GB of memory per node (2GB per core)
• 2.8 GHz Intel Xeon Westmere
• Interconnect: Infiniband DDR
• Production: 2Q 2011

Scalable Unit 8
(Decommissioned: March 2016)

• Manufacturer: IBM
• 606 Tflop/s
• 7,680 Intel Xeon Sandy Bridge processor cores
• IBM iDataPlex Compute Nodes
• 480 Intel Many Integrated Core (Phi) co-processors
• 2 oct-core processors per node
• 32 GB of memory per node (2GB per core)
• 2.6 GHz Intel Xeon Sandy Bridge
• Interconnect: Infiniband QDR
• Production: 3Q 2012

Scalable Unit 9
(Decommissioned: April 2019)

• Manufacturer: IBM
• 91 Tflop/s
• 4,480 Intel Xeon Sandy Bridge processor cores
• IBM iDataPlex Compute Nodes
• 2 8-core processors per node
• 64 GB of memory per node (4GB per core)
• No Swap Space
• 2.6 GHz Intel Xeon Sandy Bridge
• Interconnect: Infiniband FDR
• Production: 3Q 2013

Scalable Unit 10
(Decommissioned: July 2023)

• Manufacturer: SGI
• 1,229 Tflop/s
• 30,240 Intel Xeon Haswell processor cores
• SGI C2112 Compute Nodes
• 2 14-core processors per node
• 128 GB of memory per node
• No Swap Space
• 2.6 GHz Intel Xeon Haswell
• Interconnect: Infiniband FDR
• Production: 1Q 2015

Scalable Unit 11
(Decommissioned: April 2021)

• Manufacturer: SGI
• 683 Tflop/s
• 17,136 Intel Xeon Haswell processor cores
• SGI C2112 Compute Nodes
• 2 14-core processors per node
• 128 GB of memory per node
• No Swap Space
• 2.6 GHz Intel Xeon Haswell
• Interconnect: Infiniband FDR
• Production: 1Q 2015

Scalable Unit 13
(Decommissioned: July 2023)

• Manufacturer: SGI
• 723 Tflop/s
• 18,144 Intel Xeon Haswell processor cores
• SGI C2112 Compute Nodes
• 2 14-core processors per node
• 128 GB of memory per node
• No Swap Space
• 2.6 GHz Intel Xeon Haswell
• Interconnect: Infiniband FDR
• Production: 2Q 2016

Scalable Unit 15
(Decommissioned: February 2024)

• Manufacturer: Aspen Systems Inc
• 1,920 Tflop/s
• 25,600 Intel Xeon Skylake processor cores
• 640 Supermicro TwinPro nodes
• 2 20-core processors per node
• 192 GB of memory per node
• No Swap Space
• 2.4 GHz Intel Xeon Skylake
• Interconnect: Intel OmniPath
• Production: 3Q 2019