<s>
The	O
Am386	B-Device
CPU	B-General_Concept
is	O
a	O
100%	O
-compatible	O
clone	O
of	O
the	O
Intel	B-General_Concept
80386	I-General_Concept
design	O
released	O
by	O
AMD	O
in	O
March	O
1991	O
.	O
</s>
<s>
It	O
sold	O
millions	O
of	O
units	O
,	O
positioning	O
AMD	O
as	O
a	O
legitimate	O
competitor	O
to	O
Intel	O
,	O
rather	O
than	O
being	O
merely	O
a	O
second	O
source	O
for	O
x86	B-Operating_System
CPUs	O
(	O
then	O
termed	O
8086-family	B-General_Concept
)	O
.	O
</s>
<s>
While	O
the	O
AM386	B-Device
CPU	B-General_Concept
was	O
essentially	O
ready	O
to	O
be	O
released	O
prior	O
to	O
1991	O
,	O
Intel	O
kept	O
it	O
tied	O
up	O
in	O
court	O
.	O
</s>
<s>
AMD	O
had	O
previously	O
been	O
a	O
second-source	O
manufacturer	O
of	O
Intel	O
's	O
Intel	B-General_Concept
8086	I-General_Concept
,	O
Intel	B-Device
80186	I-Device
and	O
Intel	B-General_Concept
80286	I-General_Concept
designs	O
,	O
and	O
AMD	O
's	O
interpretation	O
of	O
the	O
contract	O
,	O
made	O
up	O
in	O
1982	O
,	O
was	O
that	O
it	O
covered	O
all	O
derivatives	O
of	O
them	O
.	O
</s>
<s>
Intel	O
,	O
however	O
,	O
claimed	O
that	O
the	O
contract	O
only	O
covered	O
the	O
80286	B-General_Concept
and	O
prior	O
processors	O
and	O
forbade	O
AMD	O
the	O
right	O
to	O
manufacture	O
80386	B-General_Concept
CPUs	O
in	O
1987	O
.	O
</s>
<s>
After	O
a	O
few	O
years	O
in	O
the	O
courtrooms	O
,	O
AMD	O
finally	O
won	O
the	O
case	O
and	O
the	O
right	O
to	O
sell	O
their	O
Am386	B-Device
in	O
March	O
1991	O
.	O
</s>
<s>
This	O
also	O
paved	O
the	O
way	O
for	O
competition	O
in	O
the	O
80386-compatible	O
32-bit	O
CPU	B-General_Concept
market	O
and	O
so	O
lowered	O
the	O
cost	O
of	O
owning	O
a	O
PC	B-Device
.	O
</s>
<s>
While	O
Intel	O
's	O
386	B-General_Concept
CPUs	O
had	O
topped	O
out	O
at	O
33	O
MHz	O
in	O
1989	O
,	O
AMD	O
introduced	O
40MHz	O
versions	O
of	O
both	O
its	O
386DX	B-General_Concept
and	O
386SX	O
out	O
of	O
the	O
gate	O
,	O
extending	O
the	O
lifespan	O
of	O
the	O
architecture	O
.	O
</s>
<s>
In	O
the	O
following	O
two	O
years	O
the	O
AMD	O
386DX-40	O
saw	O
popularity	O
with	O
small	O
manufacturers	O
of	O
PC	B-Device
clones	O
and	O
with	O
budget-minded	O
computer	O
enthusiasts	O
because	O
it	O
offered	O
near-80486	O
performance	O
at	O
a	O
much	O
lower	O
price	O
than	O
an	O
actual	O
486	B-General_Concept
.	O
</s>
<s>
Generally	O
the	O
386DX-40	O
performs	O
nearly	O
on	O
par	O
with	O
a	O
25	O
MHz	O
486	B-General_Concept
due	O
to	O
the	O
486	B-General_Concept
needing	O
fewer	O
clock	O
cycles	O
per	O
instruction	O
,	O
thanks	O
to	O
its	O
tighter	O
pipelining	B-General_Concept
(	O
more	O
overlapping	O
of	O
internal	O
processing	O
)	O
in	O
combination	O
with	O
an	O
on-chip	O
CPU	B-General_Concept
cache	I-General_Concept
.	O
</s>
<s>
However	O
,	O
its	O
32-bit	O
40MHz	O
data	B-General_Concept
bus	I-General_Concept
gave	O
the	O
386DX-40	O
comparatively	O
good	O
memory	O
and	O
I/O	O
performance	O
.	O
</s>
<s>
+	O
The	O
various	O
models	O
of	O
the	O
Am386DE	O
,	O
data	O
from	O
Model	O
number	O
Frequency	O
FSB	B-Architecture
Voltage	B-Device
Power	B-General_Concept
Socket	B-General_Concept
Release	O
date	O
AMD	O
Am386DE-25KC	O
25	O
MHz	O
3-5	O
V	O
0.32-1.05	O
Watt	O
132-pin	O
PQFP	O
?	O
</s>
<s>
In	O
fact	O
,	O
it	O
was	O
AMD	O
's	O
first	O
entry	O
in	O
the	O
x86	B-Operating_System
market	O
other	O
than	O
as	O
a	O
second	O
source	O
for	O
Intel	O
.	O
</s>
<s>
Power	B-General_Concept
consumption	O
was	O
up	O
to	O
35%	O
lower	O
than	O
with	O
Intel	O
's	O
design	O
and	O
even	O
lower	O
than	O
the	O
386SL	O
's	O
,	O
making	O
the	O
AMD	O
386SX	O
the	O
ideal	O
chip	O
for	O
both	O
desktop	O
and	O
mobile	O
computers	O
.	O
</s>
<s>
The	O
SXL	O
versions	O
featured	O
advanced	O
power	B-General_Concept
management	O
functions	O
and	O
used	O
even	O
less	O
power	B-General_Concept
.	O
</s>
<s>
prefetch	O
unit	O
reads	O
two	O
bytes	O
as	O
one	O
unit	O
(	O
like	O
the	O
80286	B-General_Concept
)	O
.	O
</s>
<s>
Floating	B-Algorithm
point	I-Algorithm
performance	O
of	O
the	O
Am386	B-Device
could	O
be	O
boosted	O
with	O
the	O
addition	O
of	O
a	O
80387DX	O
or	O
80387SX	O
coprocessor	B-General_Concept
,	O
although	O
performance	O
would	O
still	O
not	O
approach	O
that	O
of	O
the	O
on-chip	O
FPU	B-General_Concept
of	O
the	O
486DX	B-General_Concept
.	O
</s>
<s>
This	O
made	O
the	O
Am386DX	O
a	O
suboptimal	O
choice	O
for	O
scientific	O
applications	O
and	O
CAD	B-Application
using	O
floating	B-Algorithm
point	I-Algorithm
intensive	O
calculations	O
.	O
</s>
<s>
Although	O
motherboards	B-Device
using	O
the	O
older	O
386	B-General_Concept
CPUs	O
often	O
had	O
limited	O
memory	O
expansion	O
possibilities	O
and	O
therefore	O
struggled	O
under	O
Windows	B-Application
95	I-Application
's	O
memory	O
requirements	O
,	O
boards	O
using	O
the	O
Am386	B-Device
were	O
sold	O
well	O
into	O
the	O
mid-1990s	O
;	O
at	O
the	O
end	O
as	O
budget	O
motherboards	B-Device
for	O
those	O
who	O
were	O
only	O
interested	O
in	O
running	O
MS-DOS	B-Application
or	O
Windows	B-Application
3.1x	I-Application
applications	O
.	O
</s>
<s>
The	O
Am386	B-Device
and	O
its	O
low-power	O
successors	O
were	O
also	O
popular	O
choices	O
for	O
embedded	B-Architecture
systems	I-Architecture
,	O
for	O
a	O
much	O
longer	O
period	O
than	O
their	O
life	O
span	O
as	O
PC	B-Device
processors	O
.	O
</s>
