IBM p690
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The IBM p690 was, at the time of its release in late 2001, the flagship of IBM's high end unix servers (pSeries) during the POWER4 era of processors. It was built to run IBM AIX Unix, although it is possible to run a version Linux minus some POWER4 specific features. It was discontinued in late 2005.
It can support up to thirty-two 1.90 GHz POWER4+ processors and 1 TB of RAM and weighs well over 1000 kg.