\noindent
{\bf
CRAY-3
}




\noindent
{\bf
Vector Register Parallel Architecture
}

\vspace {.1in}
\noindent
The machine is essentially a GaAs version of the CRAY-2
being developed by a new company under Seymour Cray at Colorado Springs.
GaAs components are being developed in cooperation with Gigabit
Logic.

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\noindent
\begin {tabbing}
aaa\=   \kill
{\bf Architecture:}\\
\>  About 300 gates/chip with gate delay of 200 picosecs.\\
\>  2 nsec cycle time\\
\>  4 logical functions/clock period.\\
\>  Instruction issue every clock.\\
\>  16 processors.\\
\>  512 Mwords static RAM with 256 or 512 way interleaving.\\
\>  Bank busy time of 25 nsec and memory cycle time of 50 nsec.\\
\>  2 ports to memory per CPU.\\
\>  Total memory bandwidth will be 16 times CRAY-2.\\
\>  VR tailgating can yield similar effect to chaining.\\
\>  Peak rate of about 16 Gflops.\\
\>  1000 Mbyte/sec channels.\\
\>  Liquid coolant immersion.
\end{tabbing}

\vspace {.1in}
\noindent
CRAY-2 imbalance removed by increasing scalar speed to
four times that of a CRAY-2 on each processor giving 12 times
scalar speed.  Aim is 100 times a CRAY-1.


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\noindent
{\bf Configuration:}
Boards reduced from the 4"x8"x1" of the CRAY-2 to 1"x1"x0.1".
There are four modules to each processor, each module containing
sixteen 1" cubes.
Overall dimensions of 28" diameter and 4" to 6"  high,
with power dissipation of 180 KW as in CRAY-2.
Power supplies take 10 cu ft and liquid coolant 100 cu ft.

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\noindent
{\bf Software:}
Operating system will be UNICOS, CRI's UNIX system.

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\noindent
{\bf Status:}
The price is likely to be around \$25M to \$30M for a full
configuration, naturally dependent on market forces at time of launch.
Full production by 1991.

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\noindent
{\bf Contact:}
\begin{flushleft}
Cray Computer Company\\
P.O. Box 17500
Colorado Springs, CO  80935
719-579-6464
\end{flushleft}

.