<s>
Socket	B-Device
478	I-Device
,	O
also	O
known	O
as	O
mPGA478	B-Device
or	O
mPGA478B	B-Device
,	O
is	O
a	O
478-contact	O
CPU	B-General_Concept
socket	I-General_Concept
used	O
for	O
Intel	O
's	O
Pentium	B-General_Concept
4	I-General_Concept
and	O
Celeron	B-Device
series	O
CPUs	B-General_Concept
.	O
</s>
<s>
Socket	B-Device
478	I-Device
was	O
launched	O
in	O
August	O
2001	O
in	O
advance	O
of	O
the	O
Northwood	O
core	O
to	O
compete	O
with	O
AMD	O
's	O
462-pin	O
Socket	O
A	O
and	O
their	O
Athlon	O
XP	O
processors	O
.	O
</s>
<s>
Socket	B-Device
478	I-Device
was	O
intended	O
to	O
be	O
the	O
replacement	O
for	O
Socket	B-Device
423	I-Device
,	O
a	O
Willamette-based	O
processor	B-General_Concept
socket	I-General_Concept
which	O
was	O
on	O
the	O
market	O
for	O
only	O
a	O
short	O
time	O
.	O
</s>
<s>
Socket	B-Device
478	I-Device
was	O
phased	O
out	O
with	O
the	O
launch	O
of	O
LGA	B-Device
775	I-Device
in	O
2004	O
.	O
</s>
<s>
Socket	B-Device
478	I-Device
was	O
used	O
for	O
all	O
Northwood	O
Pentium	B-General_Concept
4	I-General_Concept
and	O
Celeron	B-Device
processors	O
.	O
</s>
<s>
It	O
supported	O
the	O
first	O
Prescott	O
Pentium	B-General_Concept
4	I-General_Concept
processors	O
and	O
all	O
Willamette	O
Celerons	B-Device
,	O
along	O
with	O
several	O
of	O
the	O
Willamette-series	O
Pentium	B-General_Concept
4s	I-General_Concept
.	O
</s>
<s>
Socket	B-Device
478	I-Device
also	O
supported	O
the	O
newer	O
Prescott-based	O
Celeron	B-Device
D	O
processors	O
,	O
and	O
early	O
Pentium	B-General_Concept
4	I-General_Concept
Extreme	I-General_Concept
Edition	I-General_Concept
processors	O
with	O
2MB	O
of	O
L3	O
CPU	B-General_Concept
cache	I-General_Concept
.	O
</s>
<s>
Celeron	B-Device
D	O
processors	O
were	O
also	O
available	O
for	O
Socket	B-Device
478	I-Device
and	O
were	O
the	O
last	O
CPUs	B-General_Concept
made	O
for	O
the	O
socket	O
.	O
</s>
<s>
While	O
the	O
Intel	O
mobile	O
CPUs	B-General_Concept
are	O
available	O
in	O
478-pin	O
packages	O
,	O
they	O
in	O
fact	O
only	O
operate	O
in	O
a	O
range	O
of	O
slightly	O
differing	O
sockets	O
,	O
Socket	B-Device
479	I-Device
,	O
Socket	B-Device
M	I-Device
,	O
and	O
Socket	B-Device
P	I-Device
,	O
each	O
incompatible	O
with	O
the	O
other	O
two	O
.	O
</s>
<s>
Socket	B-Device
478	I-Device
is	O
used	O
in	O
combination	O
with	O
DDR	O
SDRAM	O
,	O
as	O
well	O
as	O
SDR	O
SDRAM	O
,	O
RDRAM	O
and	O
DDR2	O
SDRAM	O
.	O
</s>
<s>
All	O
sockets	O
(	O
Pentium	B-General_Concept
4	I-General_Concept
and	O
Celeron	B-Device
)	O
have	O
the	O
following	O
mechanical	O
maximum	O
load	O
limits	O
which	O
should	O
not	O
be	O
exceeded	O
during	O
heatsink	O
assembly	O
,	O
shipping	O
conditions	O
,	O
or	O
standard	O
use	O
.	O
</s>
