Cray XT4

The Cray XT4 (codenamed Hood during development) is an updated version of the Cray XT3 supercomputer. It was released on November 18, 2006. It includes an updated version of the SeaStar interconnect router called SeaStar2, processor sockets for Socket AM2 Opteron processors, and 240-pin unbuffered DDR2 memory. The XT4 also includes support for FPGA coprocessors that plug into riser cards in the Service and IO blades. The interconnect, cabinet, system software and programming environment remain unchanged from the Cray XT3. It was superseded in 2007 by the Cray XT5.

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Cray computers

Cray Research	Cray-1 Cray X-MP Cray-2 Cray Y-MP Cray XMS Cray Y-MP EL Cray C90 Cray EL90 Cray T3D Cray J90 Cray T90 Cray T3E Cray SV1

Cray Computer Corp.	Cray-3 Cray-3/SSS Cray-4

Cray Research Superservers	Cray APP Cray S-MP Cray CS6400

Cray Inc.	Cray SX-6 Cray MTA-2 Cray Red Storm Cray X1 Cray XT3 Cray XD1 Cray XT4 Cray XMT Cray XT5 Cray CX1 Cray XT6 Cray XE6 Cray CX1000 Cray XK6 Cray XK7 Cray XC30 Cray XC40 Urika-XA Urika-GD

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