<s>
The	O
Cray	B-Device
XT6	I-Device
is	O
an	O
updated	O
version	O
of	O
the	O
Cray	B-Device
XT5	I-Device
supercomputer	B-Architecture
,	O
launched	O
on	O
16	O
November	O
2009	O
.	O
</s>
<s>
The	O
dual	O
-	O
or	O
quad-core	O
AMD	B-General_Concept
Opteron	I-General_Concept
2000-series	O
processors	O
of	O
the	O
XT5	B-Device
are	O
replaced	O
in	O
the	O
XT6	O
with	O
eight	O
-	O
or	O
12-core	O
Opteron	B-General_Concept
6100	O
processors	O
,	O
giving	O
up	O
to	O
2,304	O
cores	O
per	O
cabinet	O
.	O
</s>
<s>
The	O
XT6	O
includes	O
the	O
same	O
SeaStar2+	O
interconnect	O
router	O
as	O
the	O
XT5	B-Device
,	O
which	O
is	O
used	O
to	O
provide	O
a	O
3-dimensional	O
torus	O
network	O
topology	O
between	O
nodes	O
.	O
</s>
<s>
Four	O
nodes	O
form	O
one	O
X6	O
compute	O
blade	B-Architecture
.	O
</s>
<s>
This	O
incorporates	O
SUSE	O
Linux	O
Enterprise	O
Server	O
and	O
Cray	O
's	O
Compute	B-Application
Node	I-Application
Linux	I-Application
.	O
</s>
<s>
The	O
XT6m	O
variant	O
,	O
announced	O
at	O
the	O
same	O
time	O
as	O
the	O
XT6	O
,	O
is	O
a	O
mid-ranged	O
supercomputer	B-Architecture
with	O
most	O
of	O
the	O
features	O
of	O
the	O
XT6	O
,	O
but	O
with	O
a	O
processor	O
interconnect	O
optimized	O
for	O
system	O
sizes	O
between	O
700	O
and	O
13000	O
cores	O
and	O
scalable	O
up	O
to	O
6	O
cabinets	O
.	O
</s>
<s>
The	O
first	O
customer	O
for	O
the	O
XT6	O
was	O
the	O
Engineering	O
and	O
Physical	O
Sciences	O
Research	O
Council	O
(	O
EPSRC	O
)	O
of	O
the	O
United	O
Kingdom	O
,	O
which	O
upgraded	O
the	O
existing	O
XT5h	O
system	O
,	O
named	O
HECToR	B-Device
,	O
at	O
the	O
University	O
of	O
Edinburgh	O
in	O
2010	O
.	O
</s>
