<s>
System	B-Device
G	I-Device
is	O
a	O
cluster	O
supercomputer	O
at	O
Virginia	O
Tech	O
consisting	O
of	O
324	O
Apple	B-Device
Mac	I-Device
Pro	I-Device
computers	O
with	O
a	O
total	O
of	O
2592	O
processing	O
cores	O
.	O
</s>
<s>
It	O
was	O
finished	O
in	O
November	O
2008	O
and	O
ranked	O
279	O
in	O
that	O
month	O
's	O
edition	O
of	O
TOP500	B-Operating_System
,	O
running	O
at	O
16.78	O
teraflops	O
and	O
peaking	O
at	O
22.94	O
teraflops	O
.	O
</s>
<s>
It	O
transmits	O
data	O
between	O
nodes	O
over	O
Gigabit	O
Ethernet	O
and	O
40Gbit/s	O
Infiniband	B-Architecture
.	O
</s>
<s>
Each	O
of	O
the	O
324	O
Mac	B-Device
Pro	I-Device
machines	O
contains	O
two	O
quad-core	O
2.8GHz	O
Xeon	O
processors	O
and	O
8	O
gigabytes	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
System	B-Device
G	I-Device
's	O
name	O
stems	O
from	O
its	O
homage	O
to	O
System	B-Device
X	I-Device
and	O
to	O
its	O
focus	O
on	O
green	O
computing	O
—	O
the	O
cluster	O
has	O
thousands	O
of	O
power	O
and	O
thermal	O
sensors	O
to	O
test	O
high	O
performance	O
computing	O
at	O
low	O
power	O
requirements	O
and	O
is	O
the	O
largest	O
power-aware	O
research	O
system	O
in	O
the	O
world	O
.	O
</s>
