<s>
VIA	O
LongHaul	B-Device
is	O
a	O
CPU	B-General_Concept
speed	B-General_Concept
throttling	I-General_Concept
and	O
power	O
saving	O
technology	O
developed	O
by	O
VIA	O
Technologies	O
.	O
</s>
<s>
By	O
executing	O
specialized	O
instructions	O
,	O
software	B-Application
can	O
exercise	O
fine	O
control	O
on	O
the	O
bus-to-core	O
frequency	O
ratio	O
and	O
CPU	B-Device
core	I-Device
voltage	I-Device
.	O
</s>
<s>
When	O
the	O
system	O
first	O
boots	B-Operating_System
,	O
the	O
ratio	O
and	O
voltage	O
are	O
set	O
to	O
hardware	O
defaults	B-General_Concept
.	O
</s>
<s>
While	O
the	O
operating	B-General_Concept
system	I-General_Concept
runs	O
,	O
a	O
CPU	B-General_Concept
driver	B-Application
controls	O
the	O
throttling	O
according	O
to	O
how	O
much	O
load	B-Operating_System
is	O
put	O
on	O
the	O
CPU	B-General_Concept
.	O
</s>
<s>
This	O
fine	O
control	O
over	O
the	O
CPU	B-General_Concept
's	O
operating	O
parameters	O
brings	O
LongHaul	B-Device
in	O
contrast	O
to	O
other	O
competing	O
technologies	O
,	O
where	O
a	O
CPU	B-General_Concept
is	O
typically	O
allowed	O
to	O
switch	O
between	O
only	O
two	O
states	O
-	O
one	O
that	O
is	O
fast	O
but	O
power-consuming	O
and	O
one	O
that	O
is	O
slow	O
but	O
uses	O
less	O
power	O
.	O
</s>
<s>
However	O
LongHaul	B-Device
is	O
considered	O
similar	O
to	O
Transmeta	O
's	O
LongRun	B-Device
technology	O
.	O
</s>
<s>
There	O
are	O
3	O
versions	O
of	O
LongHaul	B-Device
:	O
</s>
<s>
Version	O
1	O
only	O
supports	O
dynamic	B-General_Concept
frequency	I-General_Concept
scaling	I-General_Concept
and	O
is	O
implemented	O
in	O
the	O
Cyrix	B-Device
III	I-Device
Samuel	O
(	O
C5A	O
)	O
core	O
and	O
C3	B-Device
Samuel	O
2	O
(	O
C5B	O
)	O
stepping	O
0	O
core	O
.	O
</s>
<s>
Version	O
2	O
adds	O
voltage	O
scaling	O
and	O
is	O
implemented	O
in	O
the	O
C3	B-Device
Samuel	O
2	O
(	O
C5B	O
)	O
stepping	O
1-7	O
and	O
Ezra	O
(	O
C5C	O
)	O
cores	O
.	O
</s>
<s>
Version	O
3	O
was	O
renamed	O
to	O
PowerSaver	B-Device
and	O
is	O
implemented	O
in	O
the	O
C3	B-Device
Ezra-T	O
(	O
C5N	O
)	O
and	O
Nehemiah	O
cores	O
as	O
well	O
as	O
the	O
C7	B-Device
Esther	O
(	O
C5J	O
)	O
core	O
.	O
</s>
<s>
Some	O
variants	O
of	O
the	O
C7-D	B-Device
do	O
not	O
support	O
PowerSaver	B-Device
.	O
</s>
