Cray XMP-24 Mainframe Serial Number 115 The predecessor of this machine, serial number 102, became operational at the National Security Agency in June, 1983. Serial number 102 was the first XMP delivered by Cray to a customer site, and thus was arguably the most powerful supercomputer in the world at that time. It was a Cray XMP22, containing two processors and two meagewords (16 Megabytes) of main memory. The machine consists of three towers: a CPU (central processing unit) and main memory tower, an IOS tower (Input/Output Subsystem) and a SSD tower (solid-state storage device, or extended memory. In July, 1987, as part of an upgrade, the original mainframe and IOS were replaced. CPU serial number 115 is a Cray XMP24, containing two processors and four meagawords (32 megabytes) of main memory. .... an overall performance rating of 420 Megaflops. The machine was retired in February, 1993. The mainframe weighs 5900 pounds. 250 kVA of 60 cycle power was consumed by this machine. Also see en.wikipedia.org/wiki/Cray_X-MP In comparison to modern CPU speeds, the X-MP had less than half of the raw power of Microsoft's Xbox console or less than 8% of an Intel Core 2 Duo E6700