<s>
A	O
CPU	B-General_Concept
card	I-General_Concept
is	O
a	O
printed	O
circuit	O
board	O
(	O
PCB	O
)	O
that	O
contains	O
the	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
of	O
a	O
computer	O
.	O
</s>
<s>
CPU	B-General_Concept
cards	I-General_Concept
are	O
specified	O
by	O
CPU	O
clock	O
frequency	O
and	O
bus	O
type	O
as	O
well	O
as	O
other	O
features	O
and	O
applications	O
built	O
into	O
the	O
card	O
.	O
</s>
<s>
CPU	B-General_Concept
cards	I-General_Concept
include	O
peripheral	B-Protocol
component	I-Protocol
interconnect	I-Protocol
(	O
PCI	B-Protocol
)	O
cards	O
,	O
modular	O
PC	B-Architecture
Cards	I-Architecture
,	O
Industry	B-Architecture
Standard	I-Architecture
Architecture	I-Architecture
(	O
ISA	O
)	O
cards	O
,	O
PCI	B-Architecture
extensions	I-Architecture
for	I-Architecture
instrumentation	I-Architecture
(	O
PXI	B-Architecture
)	O
cards	O
and	O
embedded	O
technology	O
extended	O
(	O
ETX	B-Device
)	O
cards	O
.	O
</s>
<s>
CPU	B-General_Concept
cards	I-General_Concept
are	O
often	O
used	O
to	O
expand	O
the	O
memory	O
,	O
speed	O
,	O
bandwidth	O
or	O
embedded	O
applications	O
of	O
an	O
existing	O
computer	O
system	O
.	O
</s>
<s>
PC	B-Architecture
cards	I-Architecture
are	O
typically	O
used	O
to	O
expand	O
a	O
system	O
's	O
embedded	O
applications	O
.	O
</s>
<s>
PC	B-Architecture
cards	I-Architecture
include	O
modules	O
for	O
audio	O
and	O
video	O
applications	O
,	O
data	O
communications	O
and	O
embedded	O
storage	O
.	O
</s>
<s>
PXI	B-Architecture
cards	O
are	O
used	O
for	O
data	O
acquisition	O
and	O
control	O
systems	O
,	O
making	O
them	O
suitable	O
for	O
real-time	O
measurement	O
applications	O
.	O
</s>
<s>
ETX	B-Device
cards	O
are	O
used	O
in	O
industrial	O
applications	O
to	O
augment	O
a	O
computer	O
system	O
's	O
embedded	O
applications	O
.	O
</s>
<s>
ETX	B-Device
cards	O
contain	O
all	O
the	O
functionality	O
necessary	O
to	O
run	O
the	O
PC	O
in	O
a	O
compact	O
space	O
.	O
</s>
<s>
CPU	B-General_Concept
cards	I-General_Concept
that	O
are	O
used	O
to	O
augment	O
existing	O
computer	O
backplanes	B-Architecture
typically	O
have	O
ISA	O
or	O
PCI	B-Protocol
connectors	O
and	O
can	O
be	O
plugged	O
into	O
the	O
backplane	B-Architecture
without	O
any	O
additional	O
configuration	O
.	O
</s>
<s>
CPU	B-General_Concept
cards	I-General_Concept
for	O
use	O
in	O
computer	O
backplanes	B-Architecture
are	O
typically	O
half-sized	O
.	O
</s>
<s>
The	O
CPU	B-General_Concept
card	I-General_Concept
contains	O
the	O
PC	O
functionality	O
and	O
communicates	O
with	O
the	O
other	O
cards	O
plugged	O
into	O
the	O
backplane	B-Architecture
through	O
a	O
computer	O
bus	O
.	O
</s>
<s>
CPU	B-General_Concept
cards	I-General_Concept
may	O
also	O
be	O
called	O
expansion	O
cards	O
or	O
expansion	O
boards	O
,	O
and	O
offer	O
a	O
variety	O
of	O
embedded	O
applications	O
from	O
modems	O
and	O
wireless	O
networking	O
to	O
graphics	O
and	O
video	O
controllers	O
to	O
RAID	B-Architecture
controllers	O
.	O
</s>
