<s>
The	O
Cray	B-Device
XK6	I-Device
made	O
by	O
Cray	O
is	O
an	O
enhanced	O
version	O
of	O
the	O
Cray	B-Device
XE6	I-Device
supercomputer	B-Architecture
,	O
announced	O
in	O
May	O
2011	O
.	O
</s>
<s>
The	O
XK6	O
uses	O
the	O
same	O
"	O
blade	B-Architecture
"	O
architecture	O
of	O
the	O
XE6	O
,	O
with	O
each	O
XK6	O
blade	B-Architecture
comprising	O
four	O
compute	O
"	O
nodes	O
"	O
.	O
</s>
<s>
Each	O
node	O
consists	O
of	O
a	O
16-core	O
AMD	B-General_Concept
Opteron	I-General_Concept
6200	O
processor	O
with	O
16	O
or	O
32	O
GB	O
of	O
DDR3	O
RAM	O
and	O
an	O
Nvidia	B-Device
Tesla	I-Device
X2090	O
GPGPU	B-Architecture
with	O
6	O
GB	O
of	O
GDDR5	O
RAM	O
,	O
the	O
two	O
connected	O
via	O
PCI	O
Express	O
2.0	O
.	O
</s>
<s>
Two	O
Gemini	O
router	O
ASICs	O
are	O
shared	O
between	O
the	O
nodes	O
on	O
a	O
blade	B-Architecture
,	O
providing	O
a	O
3-dimensional	O
torus	O
network	O
topology	O
between	O
nodes	O
.	O
</s>
<s>
The	O
XK6	O
is	O
capable	O
of	O
scaling	O
to	O
500,000	O
Opteron	B-General_Concept
cores	O
,	O
giving	O
up	O
to	O
50	O
petaflops	O
total	O
hybrid	O
peak	O
performance	O
.	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
first	O
order	O
for	O
an	O
XK6	O
system	O
was	O
an	O
upgrade	O
of	O
an	O
existing	O
XE6m	O
at	O
the	O
Swiss	O
National	O
Supercomputing	B-Architecture
Centre	O
(	O
CSCS	O
)	O
.	O
</s>
