All of these computers use a passive backplane into which system boards are plugged. Each system board provides CPUs, memory, and an I/O bus. As system boards are added, these components are added to the whole in a completely seamless fashion. It is not a cluster, but works as a single large machine.
All Sun4d machines provide JTAG ports.
The SPARCserver 1000 is a 5U rackmountable chassis with four 40 MHz XDBus slots, and space for four half-height 3.5" SCSI drives plus two half-height front-accessible 5.25" SCSI drives (typically used for CD-ROM and DAT). Each system board connects to one XDBus and provides two MBus slots for CPUs, three SBus slots for I/O boards, four banks of memory (four SIMMs apiece), and builtin SCSI-2, 10baseT Ethernet, and two serial ports.
Maximum configuration: 8 CPUs and 2 GB RAM.
The SPARCserver 1000E has a slightly faster XDBus (50 MHz). The system boards are not backwards compatible.
The SPARCserver 1000, like earlier Sun-4/xxx servers, has a set of LEDs on each system board that display diagnostics on POST, and CPU load while running. These allow the user to see at a glance how busy each processor on the system is. They are informally referred to as "Cylon" displays, because the way each displays a single light bouncing back and forth resembles the scanner of the robots in the original Battlestar Galactica TV series.
Maximum configuration: 20 CPUs and 5 GB RAM.
The SPARCcenter 2000E has a slightly faster XDBus (50 MHz). The system boards are not backwards compatible.
The Cray CS6400 is a 16-slot, 55 MHz quad-XDBus system. Each system board provides four MBus slots, four SBus slots, four banks of memory, and no builtin I/O ports.
Maximum configuration: 64 CPUs and 16 GB RAM.
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