This 1997 Cray Research model T3E-900 was donated by MIT Lincoln Laboratories. Cray T3Es use DEC 21164 Alpha CPUs and were available with several processor clock speeds. They were also available in both air and liquid models. The air cooled systems have a maximum of 128 CPUs and the liquid cooled systems have a maximum of 2048 CPUs The two cabinets on the right contain 1 Clock Module and 9 PEMS for a total of 36 21164 DEC Alpha processors. The processor cabinets are connected to the I/O cabinets with a GigaRing. The two PC-10B cabinets on the left contain 2 FCNs (Fibre Channel Nodes), 1 DSS-1 SCSI disk array with 4 drives, 4 DFS-1 Fibre Channel disk arrays with 40 drives, and the MPN (Multipurpose I/O Node).