<s>
The	O
Cyrix	B-Device
Cx486	I-Device
was	O
an	O
x86	B-Operating_System
microprocessor	I-Operating_System
designed	O
by	O
Cyrix	O
.	O
</s>
<s>
It	O
primarily	O
competed	O
with	O
the	O
Intel	B-General_Concept
486	I-General_Concept
with	O
which	O
it	O
was	O
software	O
compatible	O
,	O
would	O
operate	O
in	O
the	O
same	O
motherboards	O
provided	O
proper	O
support	O
by	O
the	O
BIOS	B-Operating_System
was	O
available	O
and	O
generally	O
showed	O
comparable	O
performance	O
.	O
</s>
<s>
The	O
chip	O
also	O
competed	O
with	O
parts	O
from	O
AMD	B-Device
and	O
UMC	B-Device
.	O
</s>
<s>
Due	O
to	O
Cyrix	O
being	O
a	O
fabless	B-Algorithm
company	O
,	O
Cyrix	O
used	O
Texas	O
Instruments	O
,	O
SGS	O
Thomson	O
and	O
IBM	O
which	O
had	O
their	O
own	O
foundries	B-Algorithm
to	O
manufacture	O
their	O
processors	O
,	O
though	O
this	O
was	O
done	O
under	O
a	O
contract	O
that	O
allowed	O
each	O
company	O
to	O
build	O
and	O
sell	O
Cyrix-designed	O
processors	O
under	O
their	O
own	O
branding	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
there	O
were	O
many	O
versions	O
of	O
the	O
Cx486	B-Device
and	O
the	O
manufacture	O
of	O
them	O
differed	O
slightly	O
depending	O
on	O
which	O
company	O
had	O
built	O
them	O
,	O
though	O
equivalent	O
chips	O
generally	O
perform	O
near-identically	O
enough	O
that	O
the	O
end	O
user	O
would	O
not	O
notice	O
any	O
difference	O
between	O
them	O
.	O
</s>
<s>
The	O
contract	O
with	O
SGS-Thomson	O
outlived	O
the	O
Cyrix	B-Device
Cx486	I-Device
processor	O
's	O
lifespan	O
in	O
the	O
mainstream	O
market	O
by	O
over	O
a	O
decade	O
with	O
SGS-Thomson	O
still	O
producing	O
industrial	O
solutions	O
built	O
upon	O
the	O
Cyrix	O
design	O
into	O
the	O
late-2000s	O
.	O
</s>
<s>
The	O
Cyrix	B-Device
Cx486	I-Device
was	O
available	O
with	O
different	O
features	O
,	O
clock	O
speeds	O
and	O
voltages	O
over	O
the	O
duration	O
of	O
its	O
production	O
.	O
</s>
<s>
Introduced	O
in	O
May	O
1993	O
,	O
The	O
Cyrix	B-Device
Cx486S	I-Device
,	O
codenamed	O
M5	O
,	O
was	O
designed	O
to	O
be	O
compatible	O
with	O
the	O
Intel	B-Device
486SX	I-Device
and	O
like	O
the	O
Intel	O
part	O
,	O
did	O
not	O
have	O
a	O
floating	O
point	O
unit	O
onboard	O
which	O
was	O
of	O
little	O
concern	O
to	O
an	O
average	O
user	O
at	O
the	O
time	O
due	O
to	O
most	O
games	O
and	O
applications	O
using	O
purely	O
integer-based	O
code	O
.	O
</s>
<s>
Users	O
could	O
upgrade	O
the	O
processor	O
to	O
486DX	B-General_Concept
specifications	O
through	O
use	O
of	O
an	O
accessory	O
,	O
the	O
Cyrix	O
Cx487S	O
which	O
was	O
an	O
x87	B-Application
Floating	O
Point	O
Unit	O
coprocessor	O
which	O
fit	O
between	O
the	O
CPU	O
and	O
the	O
socket	O
on	O
the	O
motherboard	O
.	O
</s>
<s>
+	O
Models	O
of	O
Cx486S	B-Device
Model/Feature	O
Bus	O
Speed	O
Clock	O
Frequency	O
Cache	O
Voltage	O
Notes	O
Cx486S-25	O
25	O
MHz	O
25	O
MHz	O
2KB	O
5	O
Volts	O
DC	O
Does	O
not	O
have	O
a	O
heatsink	O
.	O
</s>
<s>
Cx486S-33	O
33	O
MHz	O
33	O
MHz	O
2KB	O
5	O
Volts	O
DC	O
Available	O
with	O
permanently	O
attached	O
heatsink	O
.	O
</s>
<s>
Cx486S-40	O
40	O
MHz	O
40	O
MHz	O
2KB	O
5	O
Volts	O
DC	O
Available	O
with	O
permanently	O
attached	O
heatsink	O
.	O
</s>
<s>
The	O
Cyrix	B-Device
Cx486DLC	I-Device
is	O
a	O
derivative	O
of	O
this	O
processor	O
and	O
was	O
used	O
to	O
upgrade	O
computers	O
on	O
the	O
80386	B-General_Concept
platform	O
.	O
</s>
<s>
Codenamed	O
M6	O
,	O
the	O
Cyrix	O
Cx486DX	O
is	O
essentially	O
the	O
same	O
as	O
the	O
Cx486S	B-Device
except	O
it	O
featured	O
an	O
internal	O
Floating	O
Point	O
Unit	O
and	O
quadruple	O
the	O
amount	O
of	O
cache	O
memory	O
.	O
</s>
<s>
This	O
is	O
reflected	O
by	O
Intel	O
and	O
AMD	B-Device
processors	O
operating	O
at	O
50MHz	O
where	O
their	O
sales	O
show	O
a	O
similar	O
trait	O
of	O
being	O
less	O
popular	O
.	O
</s>
<s>
It	O
was	O
intended	O
to	O
compete	O
with	O
the	O
Intel	B-Device
80486DX2	I-Device
and	O
had	O
similar	O
capabilities	O
.	O
</s>
<s>
The	O
final	O
version	O
of	O
the	O
Cx486	B-Device
to	O
bear	O
the	O
Cyrix	O
name	O
was	O
a	O
Clock	O
Tripling	O
CPU	O
which	O
was	O
only	O
available	O
with	O
a	O
100MHz	O
Internal	O
Clock	O
.	O
</s>
<s>
Introduced	O
in	O
September	O
1995	O
,	O
it	O
was	O
otherwise	O
not	O
vastly	O
different	O
to	O
the	O
older	O
designs	O
and	O
proved	O
to	O
be	O
competitive	O
both	O
performance-wise	O
and	O
price-wise	O
against	O
offerings	O
from	O
AMD	B-Device
and	O
Intel	O
though	O
it	O
was	O
later	O
to	O
market	O
than	O
its	O
competitors	O
.	O
</s>
<s>
The	O
Cyrix	O
Cx486DX2	O
design	O
was	O
used	O
by	O
STMicroelectronics	O
in	O
1999	O
for	O
their	O
STPC	O
SoC	B-Architecture
range	O
.	O
</s>
<s>
This	O
was	O
essentially	O
a	O
Cyrix	B-Device
Cx486	I-Device
,	O
chipset	O
,	O
graphics	O
and	O
most	O
I/O	O
integrated	O
into	O
a	O
single	O
chip	O
.	O
</s>
<s>
The	O
STPC	O
was	O
produced	O
until	O
2008	O
and	O
was	O
found	O
in	O
a	O
variety	O
of	O
systems	O
,	O
usually	O
small	O
embedded	O
systems	O
for	O
industrial	O
use	O
or	O
Single-board	B-Device
computer	I-Device
devices	O
,	O
such	O
as	O
those	O
using	O
the	O
PC/104	B-Device
form	O
factor	O
.	O
</s>
<s>
One	O
notable	O
difference	O
between	O
the	O
STPC	O
and	O
other	O
Cx486	B-Device
processors	O
is	O
the	O
Host	O
Clock	O
which	O
operates	O
at	O
66	O
MHz	O
for	O
STPC	O
devices	O
.	O
</s>
<s>
This	O
differs	O
from	O
most	O
competing	O
systems	O
,	O
such	O
as	O
the	O
AMD	B-Device
Élan	O
processors	O
based	O
on	O
AMD	B-Device
's	O
Enhanced	O
Am486	B-Device
core	O
as	O
used	O
in	O
the	O
Am5x86	B-Device
which	O
still	O
relied	O
upon	O
a	O
33	O
MHz	O
external	O
clock	O
.	O
</s>
