<s>
The	O
Cray-4	B-Device
was	O
intended	O
to	O
be	O
Cray	O
Computer	O
Corporation	O
's	O
successor	O
to	O
the	O
failed	O
Cray-3	B-Device
supercomputer	B-Architecture
.	O
</s>
<s>
It	O
was	O
marketed	O
to	O
compete	O
with	O
the	O
T90	B-Device
from	O
Cray	O
Research	O
.	O
</s>
<s>
CCC	O
went	O
bankrupt	O
in	O
1995	O
before	O
any	O
Cray-4	B-Device
had	O
been	O
delivered	O
.	O
</s>
<s>
The	O
earlier	O
Cray-3	B-Device
was	O
the	O
first	O
major	O
application	O
of	O
gallium	O
arsenide	O
(	O
GaAs	O
)	O
semiconductors	O
in	O
computing	O
.	O
</s>
<s>
It	O
was	O
not	O
considered	O
a	O
success	O
,	O
and	O
only	O
one	O
Cray-3	B-Device
was	O
delivered	O
.	O
</s>
<s>
Seymour	O
Cray	O
moved	O
on	O
to	O
the	O
Cray-4	B-Device
design	O
,	O
announcing	O
the	O
design	O
in	O
1994	O
.	O
</s>
<s>
The	O
Cray-4	B-Device
was	O
essentially	O
a	O
shrunk	O
and	O
sped-up	O
version	O
of	O
the	O
Cray-3	B-Device
,	O
consisting	O
of	O
a	O
number	O
of	O
vector	B-Operating_System
processors	I-Operating_System
attached	O
to	O
a	O
fast	O
memory	O
.	O
</s>
<s>
The	O
Cray-3	B-Device
supported	O
from	O
four	O
to	O
sixteen	O
processors	O
running	O
at	O
474MHz	O
,	O
while	O
the	O
Cray-4	B-Device
scaled	O
from	O
four	O
to	O
sixty-four	O
processors	O
running	O
at	O
1GHz	O
.	O
</s>
<s>
The	O
final	O
packaging	O
for	O
the	O
Cray-4	B-Device
was	O
intended	O
to	O
fit	O
into	O
,	O
and	O
was	O
to	O
be	O
tested	O
in	O
the	O
smaller	O
one-CPU	O
"	O
tanks	O
"	O
from	O
the	O
Cray-3	B-Device
.	O
</s>
<s>
The	O
local	O
memory	O
architecture	O
used	O
on	O
the	O
Cray-2	O
and	O
Cray-3	B-Device
was	O
dropped	O
,	O
returning	O
to	O
the	O
mass	O
of	O
B	O
-	O
and	O
T	O
-	O
registers	O
on	O
earlier	O
designs	O
,	O
owing	O
to	O
Seymour	O
's	O
lack	O
of	O
success	O
using	O
the	O
local	O
memory	O
effectively	O
.	O
</s>
<s>
"	O
Significant	O
technical	O
progress	O
was	O
made	O
during	O
1994	O
on	O
the	O
CRAY-4	B-Device
,	O
which	O
takes	O
advantage	O
of	O
technologies	O
and	O
manufacturing	O
processes	O
developed	O
during	O
the	O
design	O
and	O
manufacture	O
of	O
the	O
CRAY-3	B-Device
.	O
</s>
<s>
The	O
Company	O
announced	O
introduction	O
of	O
the	O
CRAY-4	B-Device
to	O
the	O
market	O
on	O
November	O
10	O
,	O
1994	O
.	O
</s>
<s>
Several	O
single	O
processor	O
CRAY-4	B-Device
prototype	O
systems	O
,	O
each	O
with	O
64	O
megawords	O
of	O
memory	O
,	O
were	O
undergoing	O
diagnostic	O
testing	O
prior	O
to	O
the	O
Company	O
filing	O
for	O
bankruptcy	O
.	O
</s>
<s>
The	O
Company	O
began	O
testing	O
individual	O
CRAY-4	B-Device
modules	O
at	O
the	O
start	O
of	O
1994	O
and	O
planned	O
to	O
be	O
able	O
to	O
deliver	O
a	O
4-processor	O
CRAY-4	B-Device
prototype	O
system	O
by	O
approximately	O
the	O
end	O
of	O
the	O
second	O
quarter	O
of	O
1995	O
.	O
</s>
<s>
Upon	O
filing	O
of	O
bankruptcy	O
,	O
the	O
Company	O
stopped	O
work	O
on	O
the	O
CRAY-4.	O
"	O
</s>
