<s>
The	O
SGI	B-Application
Origin	I-Application
350	I-Application
is	O
a	O
mid-range	O
server	B-Application
computer	I-Application
developed	O
and	O
manufactured	O
by	O
SGI	O
introduced	O
in	O
2003	O
.	O
</s>
<s>
Their	O
discontinuation	O
in	O
December	O
2006	O
brought	O
to	O
a	O
close	O
almost	O
two	O
decades	O
of	O
MIPS	B-Device
and	O
IRIX	B-Operating_System
computing	O
.	O
</s>
<s>
The	O
Origin	O
350	O
is	O
based	O
on	O
the	O
NUMAflex	O
architecture	O
,	O
where	O
a	O
system	O
is	O
constructed	O
from	O
a	O
varying	O
number	O
of	O
modules	O
connected	O
together	O
using	O
the	O
NUMAlink3	B-Architecture
interconnect	O
via	O
cables	O
.	O
</s>
<s>
For	O
systems	O
with	O
more	O
than	O
8	O
processors	O
,	O
a	O
2U	O
NUMAlink	B-Architecture
module	O
is	O
required	O
for	O
routing	O
.	O
</s>
<s>
Multiple	O
modules	O
are	O
coordinated	O
at	O
power	O
up	O
by	O
an	O
L2	O
controller	O
which	O
communicated	O
to	O
the	O
modules	O
via	O
USB	B-Protocol
ports	O
.	O
</s>
<s>
The	O
L2	O
controller	O
was	O
an	O
external	O
PowerPC	B-Architecture
computer	O
running	O
Linux	B-Application
with	O
console	O
,	O
USB	B-Protocol
,	O
modem	O
and	O
Ethernet	O
ports	O
.	O
</s>
<s>
Each	O
compute	O
module	O
features	O
an	O
IP53	O
node	O
board	O
,	O
which	O
contains	O
two	O
or	O
four	O
MIPS	B-Device
R16000	O
microprocessors	B-Architecture
clocked	O
at	O
600	O
or	O
700MHz	O
with	O
4	O
MB	O
of	O
ECC	B-General_Concept
L2	O
cache	O
,	O
eight	O
DIMM	B-General_Concept
slots	O
for	O
1	O
to	O
8	O
GB	O
of	O
ECC	B-General_Concept
memory	I-General_Concept
,	O
a	O
Bedrock	O
ASIC	O
serving	O
as	O
the	O
crossbar	O
for	O
enabling	O
communication	O
between	O
the	O
processors	O
,	O
memory	O
and	O
PCI-X	O
slots	O
.	O
</s>
<s>
The	O
difference	O
between	O
these	O
two	O
models	O
is	O
that	O
the	O
inclusion	O
of	O
a	O
SCSI	B-Architecture
disk	O
drive	O
and	O
an	O
IO9	O
input/output	B-General_Concept
card	O
is	O
mandatory	O
in	O
the	O
base	O
compute	O
module	O
,	O
but	O
optional	O
in	O
the	O
system	O
expansion	O
compute	O
module	O
.	O
</s>
<s>
The	O
IO9	O
input/output	B-General_Concept
card	O
connects	O
to	O
a	O
PCI-X	O
slot	O
and	O
provides	O
SCSI	B-Architecture
interfaces	O
for	O
two	O
internal	O
disks	O
,	O
an	O
external	O
SCSI	B-Architecture
port	O
,	O
audio	O
I/O	B-General_Concept
and	O
a	O
10/100/1000BASE	O
-T	O
Ethernet	O
connection	O
.	O
</s>
