<s>
The	O
Cray	B-Device
T3E	I-Device
was	O
Cray	O
Research	O
's	O
second-generation	O
massively	B-Operating_System
parallel	I-Operating_System
supercomputer	O
architecture	O
,	O
launched	O
in	O
late	O
November	O
1995	O
.	O
</s>
<s>
The	O
first	O
T3E	B-Device
was	O
installed	O
at	O
the	O
Pittsburgh	O
Supercomputing	O
Center	O
in	O
1996	O
.	O
</s>
<s>
Like	O
the	O
previous	O
Cray	B-Device
T3D	I-Device
,	O
it	O
was	O
a	O
fully	O
distributed	O
memory	O
machine	O
using	O
a	O
3D	O
torus	O
topology	O
interconnection	O
network	O
.	O
</s>
<s>
The	O
T3E	B-Device
initially	O
used	O
the	O
DEC	O
Alpha	B-General_Concept
21164	I-General_Concept
(	O
EV5	O
)	O
microprocessor	B-Architecture
and	O
was	O
designed	O
to	O
scale	O
from	O
8	O
to	O
2,176	O
Processing	O
Elements	O
(	O
PEs	O
)	O
.	O
</s>
<s>
Unlike	O
many	O
other	O
MPP	O
systems	O
,	O
including	O
the	O
T3D	B-Device
,	O
the	O
T3E	B-Device
was	O
fully	O
self-hosted	O
and	O
ran	O
the	O
UNICOS/mk	O
distributed	B-Operating_System
operating	I-Operating_System
system	I-Operating_System
with	O
a	O
GigaRing	O
I/O	O
subsystem	O
integrated	O
into	O
the	O
torus	O
for	O
network	O
,	O
disk	O
and	O
tape	O
I/O	O
.	O
</s>
<s>
The	O
original	O
T3E	B-Device
(	O
retrospectively	O
known	O
as	O
the	O
T3E-600	O
)	O
had	O
a	O
300	O
MHz	O
processor	O
clock	O
.	O
</s>
<s>
Later	O
variants	O
,	O
using	O
the	O
faster	O
21164A	O
(	O
EV56	B-General_Concept
)	O
processor	O
,	O
comprised	O
the	O
T3E-900	O
(	O
450	O
MHz	O
)	O
,	O
T3E-1200	O
(	O
600	O
MHz	O
)	O
,	O
T3E-1200E	O
(	O
with	O
improved	O
memory	O
and	O
interconnect	O
performance	O
)	O
and	O
T3E-1350	O
(	O
675	O
MHz	O
)	O
.	O
</s>
<s>
The	O
T3E	B-Device
was	O
available	O
in	O
both	O
air-cooled	O
(	O
AC	O
)	O
and	O
liquid-cooled	O
(	O
LC	O
)	O
configurations	O
.	O
</s>
<s>
A	O
1480-processor	O
T3E-1200	O
was	O
the	O
first	O
supercomputer	O
to	O
achieve	O
a	O
performance	O
of	O
more	O
than	O
1	O
teraflops	O
running	O
a	O
computational	O
science	O
application	O
,	O
in	O
1998	O
.	O
</s>
<s>
While	O
providing	O
the	O
-900	O
,	O
-1200	O
and	O
-1200E	O
upgrades	O
to	O
the	O
T3E	B-Device
,	O
in	O
the	O
long	O
term	O
Silicon	O
Graphics	O
intended	O
Cray	B-Device
T3E	I-Device
users	O
to	O
migrate	O
to	O
the	O
Origin	O
3000	O
,	O
a	O
MIPS-based	O
distributed	B-Operating_System
shared	I-Operating_System
memory	I-Operating_System
computer	O
,	O
introduced	O
in	O
2000	O
.	O
</s>
<s>
However	O
,	O
the	O
T3E	B-Device
continued	O
in	O
production	O
after	O
SGI	O
sold	O
the	O
Cray	O
business	O
the	O
same	O
year	O
.	O
</s>
