<s>
The	O
Bluefire	B-Device
Supercomputer	I-Device
is	O
an	O
IBM	O
supercomputer	B-Architecture
installed	O
in	O
May	O
2008	O
by	O
the	O
National	O
Center	O
for	O
Atmospheric	O
Research	O
(	O
NCAR	O
)	O
.	O
</s>
<s>
Scientists	O
at	O
NCAR	O
,	O
and	O
across	O
the	O
country	O
,	O
use	O
the	O
system	O
to	O
accelerate	O
research	O
into	O
climate	O
change	O
,	O
including	O
future	O
patterns	O
of	O
precipitation	O
and	O
drought	O
around	O
the	O
world	O
,	O
changes	O
to	O
agriculture	O
and	O
growing	O
seasons	O
,	O
and	O
the	O
complex	O
influence	O
of	O
global	O
warming	O
on	O
hurricanes	B-Application
.	O
</s>
<s>
When	O
first	O
installed	O
,	O
it	O
was	O
ranked	O
at	O
number	O
38	O
on	O
the	O
list	O
of	O
the	O
world	O
's	O
most	O
powerful	O
supercomputers	B-Architecture
.	O
</s>
<s>
After	O
undergoing	O
acceptance	O
testing	O
,	O
Bluefire	O
began	O
full	O
operations	O
in	O
August	O
2008	O
and	O
replaced	O
three	O
supercomputers	B-Architecture
with	O
an	O
aggregate	O
peak	O
speed	O
of	O
20	O
teraflop	O
.	O
</s>
<s>
Bluefire	O
uses	O
the	O
POWER6	B-Device
microprocessor	B-Architecture
,	O
each	O
having	O
a	O
clock	O
speed	O
of	O
4.7	O
gigahertz	O
.	O
</s>
<s>
Heat	O
is	O
removed	O
from	O
the	O
electronics	O
by	O
water-chilled	O
copper	O
plates	O
mounted	O
in	O
direct	O
contact	O
with	O
each	O
POWER6	B-Device
microprocessor	B-Architecture
chip	O
.	O
</s>
<s>
As	O
a	O
result	O
of	O
this	O
water-cooled	O
system	O
and	O
POWER6	B-Device
efficiencies	O
,	O
Bluefire	O
is	O
three	O
times	O
more	O
energy	O
efficient	O
per	O
rack	O
than	O
its	O
predecessor	O
.	O
</s>
