<s>
System	O
x	O
is	O
a	O
line	O
of	O
x86	B-Operating_System
servers	B-Application
produced	O
by	O
IBM	O
,	O
and	O
later	O
by	O
Lenovo	O
,	O
as	O
a	O
sub-brand	O
of	O
IBM	O
's	O
System	O
brand	O
,	O
alongside	O
IBM	B-Device
Power	I-Device
Systems	I-Device
,	O
IBM	B-Device
System	I-Device
z	I-Device
and	O
IBM	B-Application
System	I-Application
Storage	I-Application
.	O
</s>
<s>
In	O
addition	O
,	O
IBM	B-Operating_System
System	I-Operating_System
x	I-Operating_System
was	O
the	O
main	O
component	O
of	O
the	O
IBM	B-Operating_System
System	I-Operating_System
Cluster	I-Operating_System
1350	I-Operating_System
solution	O
.	O
</s>
<s>
In	O
January	O
2014	O
,	O
IBM	O
announced	O
the	O
sale	O
of	O
its	O
x86	B-Operating_System
server	B-Application
business	O
to	O
Lenovo	O
for	O
$2.3	O
billion	O
,	O
in	O
a	O
sale	O
completed	O
October	O
1	O
,	O
2014	O
.	O
</s>
<s>
Starting	O
out	O
with	O
the	O
PS/2	B-Device
Server	B-Application
,	O
then	O
the	O
IBM	B-Operating_System
PC	I-Operating_System
Server	I-Operating_System
,	O
rebranded	O
Netfinity	B-Application
,	O
then	O
eServer	B-Application
xSeries	I-Application
and	O
finally	O
System	O
x	O
,	O
these	O
servers	B-Application
are	O
distinguished	O
by	O
being	O
based	O
on	O
off-the-shelf	O
x86	B-Operating_System
CPUs	O
;	O
IBM	O
positioned	O
them	O
as	O
their	O
"	O
low	O
end	O
"	O
or	O
"	O
entry	O
"	O
offering	O
compared	O
to	O
their	O
POWER	O
and	O
Mainframe	O
products	O
.	O
</s>
<s>
Previously	O
IBM	O
servers	B-Application
based	O
on	O
AMD	B-General_Concept
Opteron	I-General_Concept
CPUs	O
did	O
not	O
share	O
the	O
xSeries	O
brand	O
;	O
instead	O
they	O
fell	O
directly	O
under	O
the	O
eServer	B-Application
umbrella	O
.	O
</s>
<s>
However	O
,	O
later	O
AMD	O
Opteron-based	O
servers	B-Application
did	O
fall	O
under	O
the	O
System	O
x	O
brand	O
.	O
</s>
<s>
1998	O
–	O
2001	O
server	B-Application
line	O
;	O
Not	O
to	O
be	O
confused	O
with	O
a	O
software	O
IBM	O
product	O
with	O
a	O
similar	O
name	O
,	O
NetFinity	B-Application
(	O
notice	O
the	O
capital	O
F	O
)	O
.	O
</s>
<s>
The	O
numbering	O
scheme	O
started	O
off	O
similar	O
to	O
that	O
of	O
the	O
IBM	B-Operating_System
PC	I-Operating_System
Servers	I-Operating_System
,	O
but	O
additional	O
ranges	O
were	O
added	O
,	O
like	O
the	O
entry-level	O
1000	O
model	O
later	O
on	O
.	O
</s>
<s>
Some	O
Netfinity	B-Application
servers	B-Application
used	O
IBM	O
's	O
C2T	B-Device
cabling	O
scheme	O
for	O
Keyboard/Video/Mouse	O
.	O
</s>
<s>
IBM	B-Application
eServer	I-Application
was	O
a	O
marketing	O
effort	O
to	O
put	O
all	O
of	O
the	O
diverse	O
IBM	O
server	B-Application
platforms	O
under	O
one	O
header	O
.	O
</s>
<s>
The	O
AS/400	B-Device
became	O
the	O
IBM	B-Device
eServer	I-Device
iSeries	I-Device
,	O
the	O
RS/6000	O
became	O
the	O
IBM	B-Device
eServer	I-Device
pSeries	I-Device
,	O
the	O
S/390	O
mainframe	O
became	O
the	O
IBM	B-Application
eServer	I-Application
zSeries	O
and	O
the	O
Intel	O
processor	O
based	O
IBM	O
Netfinity	B-Application
servers	B-Application
became	O
the	O
IBM	B-Operating_System
eServer	I-Operating_System
xSeries	I-Operating_System
.	O
</s>
<s>
For	O
marketing	O
reasons	O
the	O
AMD	O
processor	O
based	O
e325	O
,	O
e326	O
and	O
e326m	O
and	O
the	O
BladeCenter	B-General_Concept
which	O
supports	O
non-Intel	O
processor	O
products	O
were	O
not	O
branded	O
xSeries	O
,	O
but	O
were	O
instead	O
placed	O
directly	O
under	O
the	O
eServer	B-Application
brand	O
.	O
</s>
<s>
The	O
xSeries	O
brand	O
was	O
limited	O
to	O
only	O
Intel-based	O
server	B-Application
products	O
.	O
</s>
<s>
From	O
a	O
numbering	O
perspective	O
the	O
AMD	O
servers	B-Application
did	O
fit	O
into	O
the	O
xSeries	O
range	O
,	O
under	O
the	O
similar	O
x335	O
and	O
x336	O
Intel	O
processor	O
products	O
.	O
</s>
<s>
While	O
most	O
servers	B-Application
used	O
Intel	B-Operating_System
x86	I-Operating_System
(	O
IA32	O
)	O
processors	O
,	O
the	O
x380	O
,	O
x382	O
,	O
x450	O
and	O
x455	O
used	O
the	O
Intel	B-General_Concept
Itanium	I-General_Concept
(	O
IA64	O
)	O
processor	O
.	O
</s>
<s>
Many	O
xSeries	O
servers	B-Application
used	O
IBM	O
's	O
C2T	B-Device
cabling	O
scheme	O
for	O
Keyboard/Video/Mouse	O
.	O
</s>
<s>
Lenovo	O
also	O
had	O
its	O
own	O
ThinkServer	B-Application
family	O
of	O
Intel	O
servers	B-Application
.	O
</s>
<s>
At	O
the	O
time	O
of	O
this	O
writing	O
,	O
System	O
x	O
is	O
being	O
discontinued	O
and	O
replaced	O
by	O
the	O
Lenovo	O
ThinkSystem	O
family	O
of	O
Intel	O
servers	B-Application
.	O
</s>
<s>
4th	O
digit	O
is	O
a	O
0	O
for	O
Intel	O
processors	O
,	O
and	O
5	O
for	O
AMD	B-General_Concept
Opteron	I-General_Concept
.	O
</s>
<s>
IBM	B-Operating_System
System	I-Operating_System
x	I-Operating_System
iDataPlex	O
,	O
introduced	O
in	O
2008	O
,	O
was	O
used	O
by	O
many	O
TOP500	B-Operating_System
supercomputers	O
(	O
as	O
part	O
of	O
IBM	B-Operating_System
Intelligent	I-Operating_System
Cluster	I-Operating_System
)	O
,	O
including	O
SuperMUC	B-Device
,	O
Yellowstone	B-Device
and	O
Stampede	O
.	O
</s>
<s>
It	O
is	O
an	O
unusual	O
form-factor	O
in	O
that	O
you	O
have	O
two	O
columns	O
of	O
19	O
"	O
rack	O
servers	B-Application
side-by-side	O
in	O
a	O
single	O
rack	O
.	O
</s>
<s>
As	O
such	O
it	O
only	O
supports	O
specially	O
designed	O
shallow	O
servers	B-Application
.	O
</s>
<s>
1U	O
blade	B-Architecture
servers	I-Architecture
.	O
</s>
