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FACILITIES AND SERVICES
CRAY C90 High Performance Vector Processor
T
he ASC Cray C90 (see Figure 2) consists of
two processing units (CPUs), a 64 million
word main memory, an I/O subsystem with 50
billion bytes of disk storage, and a 32 million word
solid state disk (SSD).
CPU
E
ach Cray C90 CPU can
produce results at a rate of
960 Million Floating Point
Operations per second (MFLOPS).
A rate of 1905 MFLOPS can be
achieved by the use of both CPUs in
parallel.
The two CPUs are identical and can process in
scalar or vector mode.
Clock period
4.2 nanoseconds
Instruction stack/buffers
256words
Functional units
15
Registers
8 x 128 vector (64 bit)
8 scalar (64 bit)
8 address (32 bit)
Maximum result rate
960 MFLOPS
Memory
4
Word length
64 bits
Cycle time
68.0 nanoseconds
Memory banks
32
Address space
64 million words
Max bandwidth/channel
150 million words /
second
Alabama Supercomputer Center User Manual - Fifth Edition