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Intrepid, a No. 9 ranked High Performance Computing (HPC) system in 2010 June's list of Top 500 supercomputer sites. It decommisioned on Dec. 31st, 2013 and was completely offline on Apr. 1, 2014.

A snapshot of ~110 million CPU-hrs burned by user "long" (me):

Project Name Jobs CPU-hrs
SupernovaModels 1977 54001712.0
FLASH_Testing 0 0
FLASH_Sedona 0 0
TurbNuclComb_es 0 0
BGQtools_esp 0 0
SupernovaVandV 3606 54227310.8
PetSimSuper 234 1578664.8

Intrepid's Blue Gene/P system configuration:
40 racks
1024 nodes per rack
850 MHz quad-core processor and 2GB RAM per node
640 I/O nodes
88 GB/s, 7.6PB Storage
For a total of 164K cores, 80 terabytes of RAM, and a peak performance of 557 teraflops.