<s>
The	O
Intel	B-Device
440BX	I-Device
(	O
codenamed	O
Seattle	O
)	O
is	O
a	O
chipset	B-Device
from	O
Intel	O
,	O
supporting	O
Pentium	B-General_Concept
II	I-General_Concept
,	O
Pentium	B-General_Concept
III	I-General_Concept
,	O
and	O
Celeron	B-Device
processors	O
.	O
</s>
<s>
It	O
is	O
also	O
known	O
as	O
the	O
i440BX	B-Device
and	O
was	O
released	O
in	O
April	O
1998	O
.	O
</s>
<s>
The	O
440BX	B-Device
originally	O
supported	O
Slot	B-Device
1	I-Device
and	O
later	O
Socket	B-Device
370	I-Device
Intel	O
P6-based	O
processors	O
in	O
single	O
and	O
SMP	B-Operating_System
configurations	O
at	O
speeds	O
of	O
up	O
to	O
1GHz	O
(	O
and	O
potentially	O
up	O
to	O
1.4GHz	O
with	O
certain	O
unsupported	O
modifications	O
,	O
up	O
to	O
1.7GHz	O
can	O
be	O
achieved	O
using	O
Front	B-Architecture
Side	I-Architecture
Bus	I-Architecture
speeds	O
higher	O
than	O
133MHz	O
and	O
appropriate	O
cooling	O
)	O
.	O
</s>
<s>
Its	O
southbridge	B-Device
counterpart	O
is	O
the	O
PIIX4E	B-Device
.	O
</s>
<s>
The	O
Intel	B-Device
440BX	I-Device
is	O
the	O
third	O
Pentium	B-General_Concept
II	I-General_Concept
chipset	B-Device
released	O
by	O
Intel	O
,	O
succeeding	O
the	O
440FX	B-Device
and	O
440LX	B-Device
.	O
</s>
<s>
With	O
the	O
new	O
100MHz	O
front	B-Architecture
side	I-Architecture
bus	I-Architecture
,	O
Pentium	B-General_Concept
II	I-General_Concept
CPUs	O
were	O
able	O
to	O
scale	O
better	O
in	O
performance	O
by	O
reducing	O
the	O
difference	O
between	O
processor	O
clock	O
and	O
bus	O
speed	O
.	O
</s>
<s>
The	O
previous	O
66MHz	O
bus	O
had	O
become	O
a	O
serious	O
bottleneck	O
and	O
dated	O
back	O
to	O
the	O
first	O
Pentium	B-General_Concept
"	I-General_Concept
Classic	I-General_Concept
"	I-General_Concept
chipsets	B-Device
.	O
</s>
<s>
The	O
440BX	B-Device
had	O
two	O
closely	O
related	O
chipset	B-Device
peers	O
;	O
the	O
440ZX	O
and	O
440MX	O
.	O
</s>
<s>
440MX	O
is	O
a	O
mobile	O
chipset	B-Device
for	O
laptops	O
,	O
although	O
a	O
number	O
of	O
notebooks	O
did	O
use	O
440BX	B-Device
.	O
</s>
<s>
440ZX	O
is	O
a	O
cost-reduced	O
version	O
of	O
440BX	B-Device
.	O
</s>
<s>
The	O
440ZX-66	O
,	O
designed	O
for	O
Intel	B-Device
Celeron	I-Device
processors	I-Device
,	O
is	O
limited	O
to	O
66MHz	O
FSB	O
speed	O
.	O
</s>
<s>
The	O
440BX	B-Device
became	O
one	O
of	O
Intel	O
's	O
most	O
popular	O
chipsets	B-Device
.	O
</s>
<s>
Enthusiasts	O
enjoyed	O
its	O
overclockability	B-Application
,	O
with	O
the	O
chipset	B-Device
capable	O
of	O
running	O
the	O
front-side	B-Architecture
bus	I-Architecture
at	O
speeds	O
ranging	O
from	O
66MHz	O
to	O
well	O
over	O
133MHz	O
,	O
in	O
stark	O
contrast	O
to	O
the	O
440LX	B-Device
's	O
struggle	O
to	O
top	O
75MHz	O
.	O
</s>
<s>
A	O
common	O
overclock	B-Application
involved	O
the	O
pin-40	O
hack	O
,	O
or	O
using	O
an	O
ABIT	O
BP6	O
or	O
Asus	O
P2B	O
,	O
and	O
setting	O
the	O
bus	O
speed	O
on	O
a	O
66MHz	O
Covington	O
or	O
Mendocino-core	O
Celeron	B-Device
to	O
100MHz	O
.	O
</s>
<s>
The	O
Mendocino-core	O
Celeron	B-Device
300A	O
became	O
a	O
"	O
sweet	O
spot	O
"	O
for	O
overclockers	B-Application
,	O
with	O
nearly	O
100%	O
success	O
rates	O
at	O
reaching	O
450MHz	O
on	O
a	O
100MHz	O
FSB	O
,	O
allowing	O
it	O
to	O
equate	O
to	O
a	O
much	O
more	O
expensive	O
Pentium	B-General_Concept
II	I-General_Concept
at	O
450MHz	O
.	O
</s>
<s>
Other	O
popular	O
overclocks	B-Application
included	O
the	O
SL2W8-stepping	O
Deschutes-core	O
Pentium	B-General_Concept
II	I-General_Concept
that	O
could	O
often	O
run	O
to	O
450MHz	O
at	O
100MHz	O
FSB	O
,	O
and	O
the	O
SL35D	O
Katmai-core	O
Pentium	B-General_Concept
III	I-General_Concept
450MHz	O
which	O
could	O
frequently	O
manage	O
600MHz	O
on	O
a	O
133MHz	O
FSB	O
.	O
</s>
<s>
The	O
later	O
Pentium	B-General_Concept
III	I-General_Concept
Coppermine-core	O
processor	O
was	O
easily	O
overclocked	O
and	O
performed	O
well	O
on	O
440BX	B-Device
motherboards	O
.	O
</s>
<s>
Finally	O
,	O
the	O
unsupported	O
Tualatin-core	O
Pentium	B-General_Concept
III	I-General_Concept
could	O
be	O
used	O
with	O
an	O
adapter	O
and	O
various	O
modifications	O
,	O
with	O
varying	O
degrees	O
of	O
success	O
.	O
</s>
<s>
Ironically	O
,	O
the	O
440BX	B-Device
offered	O
better	O
performance	O
than	O
several	O
of	O
its	O
successors	O
.	O
</s>
<s>
The	O
i810	B-Device
and	O
i820	O
chipsets	B-Device
were	O
unable	O
to	O
beat	O
the	O
440BX	B-Device
at	O
the	O
100MHz	O
FSB	O
speed	O
.	O
</s>
<s>
The	O
i820	O
was	O
plagued	O
with	O
a	O
requirement	O
for	O
high	O
cost	O
RDRAM	O
to	O
reach	O
good	O
performance	O
,	O
along	O
with	O
a	O
string	O
of	O
reliability	O
issues	O
involving	O
an	O
RDRAM-to-SDRAM	O
memory	O
translator	O
hub	O
in	O
designs	O
using	O
that	O
chipset	B-Device
with	O
SDRAM	O
.	O
</s>
<s>
Unofficially	O
,	O
the	O
440BX	B-Device
could	O
often	O
be	O
taken	O
to	O
133MHz	O
FSB	O
.	O
</s>
<s>
Enthusiast	O
motherboards	O
,	O
such	O
as	O
the	O
Asus	O
P3B-F	O
and	O
Abit	O
BH6/BF6/BE6	O
series	O
,	O
were	O
equipped	O
with	O
BIOS	B-Operating_System
options	O
to	O
set	O
the	O
board	O
to	O
this	O
unofficial	O
speed	O
.	O
</s>
<s>
With	O
a	O
133MHz	O
FSB	O
,	O
the	O
440BX	B-Device
could	O
even	O
match	O
the	O
later	O
i815	O
chipset	B-Device
,	O
which	O
was	O
designed	O
to	O
accommodate	O
the	O
final	O
Tualatin-core	O
Pentium	B-General_Concept
III	I-General_Concept
.	O
</s>
<s>
Unfortunately	O
,	O
running	O
a	O
440BX	B-Device
above	O
100MHz	O
FSB	O
resulted	O
in	O
the	O
AGP	B-Architecture
video	O
card	O
being	O
forced	O
to	O
run	O
on	O
an	O
overclocked	O
AGP	B-Architecture
bus	O
,	O
as	O
the	O
440BX	B-Device
only	O
had	O
"	O
2/3	O
"	O
and	O
"	O
1/1	O
"	O
bus	O
dividers	O
.	O
</s>
<s>
Some	O
video	O
cards	O
were	O
tolerant	O
of	O
this	O
,	O
such	O
as	O
various	O
early	O
NVIDIA	B-Application
GeForce	I-Application
cards	O
,	O
but	O
more	O
than	O
a	O
few	O
were	O
unstable	O
with	O
a	O
35%	O
AGP	B-Architecture
overclock	B-Application
.	O
</s>
<s>
The	O
PCI	O
bus	O
was	O
not	O
affected	O
by	O
this	O
problem	O
(	O
there	O
was	O
a	O
"	O
1/4	O
"	O
bus	O
divider	O
for	O
the	O
PCI	O
bus	O
on	O
the	O
440BX	B-Device
)	O
so	O
users	O
could	O
use	O
a	O
PCI	O
graphics	O
card	O
in	O
lieu	O
of	O
an	O
AGP	B-Architecture
one	O
.	O
</s>
<s>
However	O
,	O
this	O
inflicted	O
a	O
performance	O
penalty	O
on	O
graphical	O
performance	O
since	O
PCI	O
has	O
significantly	O
lower	O
bandwidth	O
throughput	O
than	O
AGP	B-Architecture
.	O
</s>
<s>
Still	O
,	O
the	O
later	O
i815	O
was	O
considered	O
the	O
best	O
Pentium	B-General_Concept
III	I-General_Concept
chipset	B-Device
because	O
it	O
offered	O
a	O
better	O
feature	O
set	O
and	O
very	O
similar	O
performance	O
relative	O
to	O
the	O
440BX	B-Device
.	O
</s>
<s>
Not	O
only	O
did	O
the	O
i815	O
support	O
a	O
proper	O
"	O
1/2	O
"	O
AGP	B-Architecture
divider	O
for	O
the	O
133MHz	O
FSB	O
clock	O
rate	O
,	O
AGP	B-Architecture
4x	O
,	O
and	O
Ultra	O
DMA	O
100	O
,	O
but	O
the	O
later	O
revisions	O
also	O
directly	O
supported	O
the	O
Tualatin	O
Pentium	B-General_Concept
III	I-General_Concept
;	O
however	O
,	O
the	O
i815	O
had	O
a	O
RAM	O
limit	O
of	O
512MB	O
compared	O
to	O
440BX	B-Device
's	O
1GB	O
RAM	O
limit	O
.	O
</s>
<s>
The	O
success	O
of	O
the	O
440BX	B-Device
chipset	B-Device
has	O
caused	O
various	O
software	O
emulation	O
and	O
virtualization	O
packages	O
to	O
use	O
it	O
as	O
part	O
of	O
their	O
virtual	O
system	O
.	O
</s>
<s>
VMware	O
and	O
Microsoft	B-Application
Virtual	I-Application
PC	I-Application
present	O
the	O
Intel	B-Device
440BX	I-Device
chipset	B-Device
virtually	O
to	O
hosted	O
virtual	B-Architecture
machines	I-Architecture
,	O
due	O
to	O
its	O
broad	O
compatibility	O
.	O
</s>
<s>
This	O
chipset	B-Device
does	O
not	O
support	O
256Mbit	O
SDRAM	O
,	O
which	O
became	O
more	O
common	O
in	O
the	O
2002	O
to	O
2003	O
period	O
.	O
</s>
<s>
The	O
higher	O
end	O
440GX	O
chipset	B-Device
released	O
in	O
June	O
1998	O
that	O
was	O
originally	O
intended	O
for	O
servers	O
and	O
workstations	O
has	O
this	O
support	O
.	O
</s>
