<s>
The	O
Memory	B-Device
Reference	I-Device
Code	I-Device
(	O
or	O
MRC	O
)	O
is	O
a	O
fundamental	O
component	O
in	O
the	O
design	O
of	O
some	O
computers	O
,	O
and	O
is	O
"	O
one	O
of	O
the	O
most	O
important	O
aspects	O
of	O
the	O
BIOS	B-Operating_System
"	O
for	O
an	O
Intel-based	O
motherboard	B-Device
.	O
</s>
<s>
It	O
is	O
the	O
part	O
of	O
an	O
Intel	O
motherboard	B-Device
's	O
firmware	B-Application
that	O
determines	O
how	O
the	O
computer	B-General_Concept
's	I-General_Concept
memory	I-General_Concept
(	O
RAM	B-Architecture
)	O
will	O
be	O
initialized	O
,	O
and	O
adjusts	O
memory	B-General_Concept
timing	I-General_Concept
algorithms	O
correctly	O
for	O
the	O
effects	O
of	O
any	O
modifications	O
set	O
by	O
the	O
user	O
or	O
computer	B-Architecture
hardware	I-Architecture
.	O
</s>
<s>
Intel	O
has	O
defined	O
the	O
Memory	B-Device
Reference	I-Device
Code	I-Device
(	O
MRC	O
)	O
as	O
follows	O
:	O
</s>
<s>
The	O
MRC	O
is	O
responsible	O
for	O
initializing	O
the	O
memory	O
as	O
part	O
of	O
the	O
POST	B-Device
process	O
at	O
power-on	O
.	O
</s>
<s>
For	O
non-validated	O
configurations	O
,	O
a	O
system	O
designer	O
should	O
work	O
with	O
their	O
BIOS	B-Operating_System
vendor	O
to	O
produce	O
a	O
working	O
MRC	O
solution	O
...	O
</s>
<s>
The	O
MRC	O
in	O
the	O
system	B-Operating_System
BIOS	I-Operating_System
needs	O
to	O
know	O
the	O
specification	O
of	O
the	O
attached	O
system	O
memory	O
.	O
</s>
<s>
Most	O
of	O
this	O
info	O
should	O
be	O
contained	O
in	O
the	O
onboard	O
SPD	B-General_Concept
.	O
</s>
<s>
With	O
this	O
in	O
mind	O
care	O
needs	O
to	O
be	O
taken	O
when	O
programming	O
the	O
appropriate	O
values	O
into	O
the	O
SPD	B-General_Concept
[	O
the	O
part	O
of	O
a	O
memory	B-General_Concept
module	I-General_Concept
that	O
contains	O
its	O
operating	O
requirements	O
and	O
specification ]	O
.	O
</s>
<s>
A	O
system	O
designer	O
should	O
work	O
with	O
their	O
memory	O
and	O
BIOS	B-Operating_System
vendors	O
to	O
implement	O
a	O
suitable	O
SPD	B-General_Concept
programming	O
.	O
</s>
<s>
As	O
such	O
,	O
the	O
MRC	O
is	O
a	O
part	O
of	O
the	O
BIOS	B-Operating_System
(	O
or	O
firmware	B-Application
)	O
of	O
an	O
Intel	O
motherboard	B-Device
.	O
</s>
<s>
The	O
MRC	O
is	O
part	O
of	O
reference	O
BIOS	B-Operating_System
code	O
,	O
which	O
relates	O
to	O
memory	O
initialization	O
in	O
the	O
BIOS	B-Operating_System
.	O
</s>
<s>
The	O
MRC	O
is	O
written	O
in	O
a	O
C-language	B-Language
code	O
,	O
which	O
can	O
be	O
edited	O
and	O
compiled	B-Language
by	O
board	O
makers	O
.	O
</s>
<s>
We	O
try	O
to	O
look	O
into	O
 [ Intel's ] 	O
Memory	B-Device
Reference	I-Device
Code	I-Device
to	O
try	O
to	O
understand	O
its	O
behaviour	O
...	O
</s>
<s>
For	O
instance	O
,	O
under	O
a	O
1,066	O
MHz	O
FSB	B-Architecture
,	O
the	O
only	O
choices	O
regarding	O
memory	O
speed	O
in	O
the	O
MRC	O
are	O
DDR2-667	O
and	O
DDR2-800	O
.	O
</s>
<s>
For	O
people	O
who	O
want	O
higher	O
memory	O
frequency	O
,	O
we	O
used	O
the	O
setting	O
of	O
800MHz	O
FSB:DDR2-800	O
in	O
MRC	O
,	O
but	O
overclocked	O
it	O
to	O
work	O
with	O
a	O
1,066	O
MHz	O
FSB	B-Architecture
,	O
so	O
we	O
could	O
implement	O
support	O
for	O
DDR2-1066	O
.	O
</s>
<s>
The	O
article	O
author	O
describes	O
the	O
MRC	O
as	O
"	O
One	O
of	O
the	O
most	O
important	O
aspects	O
of	O
the	O
BIOS	B-Operating_System
for	O
an	O
Intel	O
board	O
"	O
and	O
the	O
reason	O
why	O
"	O
one	O
[	O
board	O
might	O
be ]	O
a	O
brilliant	O
overclocker	B-Application
and	O
another	O
 [ is ] 	O
as	O
stable	O
as	O
a	O
plate	O
of	O
jelly	O
on	O
a	O
bouncy	O
castle	O
"	O
;	O
adding	O
that	O
"	O
When	O
you	O
're	O
overclocking	B-Application
,	O
you	O
're	O
literally	O
running	O
clocks	O
faster	O
than	O
normal	O
.	O
</s>
<s>
Working	O
out	O
the	O
effect	O
of	O
this	O
on	O
the	O
various	O
different	O
components	O
on	O
the	O
board	O
is	O
a	O
task	O
that	O
a	O
good	O
BIOS	B-Operating_System
must	O
be	O
able	O
to	O
handle.	O
"	O
</s>
