<s>
The	O
page	B-General_Concept
attribute	I-General_Concept
table	I-General_Concept
(	O
PAT	O
)	O
is	O
a	O
processor	B-General_Concept
supplementary	I-General_Concept
capability	I-General_Concept
extension	O
to	O
the	O
page	B-General_Concept
table	I-General_Concept
format	O
of	O
certain	O
x86	B-Operating_System
and	O
x86-64	B-Device
microprocessors	O
.	O
</s>
<s>
Like	O
memory	B-General_Concept
type	I-General_Concept
range	I-General_Concept
registers	I-General_Concept
(	O
MTRRs	O
)	O
,	O
they	O
allow	O
for	O
fine-grained	O
control	O
over	O
how	O
areas	O
of	O
memory	O
are	O
cached	B-General_Concept
,	O
and	O
are	O
a	O
companion	O
feature	O
to	O
the	O
MTRRs	O
.	O
</s>
<s>
Unlike	O
MTRRs	O
,	O
which	O
provide	O
the	O
ability	O
to	O
manipulate	O
the	O
behavior	O
of	O
caching	O
for	O
a	O
limited	O
number	O
of	O
fixed	O
physical	O
address	O
ranges	O
,	O
Page	B-General_Concept
Attribute	I-General_Concept
Tables	I-General_Concept
allow	O
for	O
such	O
behavior	O
to	O
be	O
specified	O
on	O
a	O
per-page	B-General_Concept
basis	O
,	O
greatly	O
increasing	O
the	O
ability	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
to	O
select	O
the	O
most	O
efficient	O
behavior	O
for	O
any	O
given	O
task	O
.	O
</s>
<s>
The	O
PAT	O
is	O
available	O
on	O
Pentium	B-General_Concept
III	I-General_Concept
and	O
newer	O
CPUs	O
,	O
and	O
on	O
non-Intel	O
CPUs	O
.	O
</s>
