processors per rack while moving to a "fat tree" interconnect topology. In January 2003, SGI announced a variant of the SN platform called the Altix 3000 (internally called SN-IA). It used Intel Itanium 2 processors and ran the Linux operating system kernel. At the time it was released, it was the world's most scalable Linux-based computer, supporting up to 64 processors in a single system node. Nodes could be connected using the same NUMAlink technology to form what SGI predictably termed "superclusters". In February 2004, SGI announced general support for 128 processor nodes to be followed by 256 and 512 processor versions that year. In April 2004, SGI announced the sale of its Alias software business for approximately $57 million. In October 2004, SGI built the supercomputer Columbia, which broke the world record for computer speed, for the NASA Ames Research Center. It was a cluster of 20 Altix supercomputers each with 512 Intel Itanium 2 processors running Linux, and achieved sustained speed of 42.7 trillion floating-point operations per second (teraflops), easily topping Japan's famed Earth Simulator's record of 35.86 teraflops. (A week later, IBM's upgraded Blue Gene/L clocked in at 70.7 teraflops.) In July 2006, SGI announced an SGI Altix 4700 system with 1,024 processors and 4 TB of memory running a single Linux system image. Hardware products Some 68k and MIPS-based models were also rebadged by other vendors, including CDC, Tandem Computers, Prime Computer and Siemens-Nixdorf. SGI Onyx and SGI Indy series systems were used for game development for the Nintendo 64. Motorola 68k-based systems IRIS 1000 series graphics terminals (diskless 1000/1200, 1400/1500 with disks) IRIS 2000 series workstations (2000/2200/2300/2400/2500 non-Turbo and 2300T/2400T/2500T "Turbo" models) IRIS 3000 series workstations (3010/3020/3030 and 3110/3115/3120/3130) MIPS-based systems Workstations Professional IRIS series (IRIS 4D/50/60/70/80/85) Personal IRIS series (IRIS 4D/20/25/30/35) IRIS Power Series (IRIS 4D/1x0/2x0/3x0/4x0) IRIS Crimson (deskside workstation/server) IRIS Indigo series (Indigo, Indigo R4000) Indigo² series (Indigo², Power Indigo², Indigo² R10000) Indy workstation O2/O2+ workstation Octane workstation Octane2 workstation Fuel entry-level workstation Tezro high-end workstation Servers Challenge S (desktop server) Challenge M/Power Challenge M (desktop server) Challenge DM (deskside server) Challenge L/Power Challenge/Challenge 10000 (deskside server) Challenge XL/Power Challenge XL (rack server) Origin 200 entry-level server Origin 2000 high-end server Origin 300 entry-level server Origin 350 mid-range server Origin 3000 high-end server Visualization Onyx (deskside and rackmount systems) Power Onyx (deskside and rackmount systems) Onyx 10000 (deskside and rackmount systems) Onyx2 (deskside