Asus P I-AP55T P/I-AP55T User's manual - Page 25

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Upgrade Guide Upgrading System Memory This section explains how to install system memory There are instructions on how to configure and install memory and an explanation of the technical specifications required. System DRAM is the main source of data for the CPU. Data remains stored in DRAM as long as the system is turned on, and is lost when you turn it off. The Level 2 cache memory is Static RAM (SRAM), which is faster than DRAM memory. When the CPU looks for data, it first searches the cache. If the information is not there, the search continues in the DRAM. With this design, the CPU looks in the fastest source of data first, which lets it operate as fast as possible. The DRAM subsystem uses memory chips permanently mounted on small circuit boards to form "SIMMs" (Single In-line Memory Modules). The memory chips have a speed rating that is measured in nanoseconds (ns). This mainboard requires either Fast Page Mode (FPM) DRAM or Extended Data Output (EDO) DRAM with a speed of at least 60 or 70ns depending on the bus clock/CPU external clock speed setting. This mainboard can use 72-pin SIMMs in four sizes from 4IVIB up to 32MB (megabytes). Depending on the combination of modules you use, you can install between 8MB and 128MB. The 32-bit modules used for this board come with memory chips on either one or both sides of the module. 2 - 5

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Upgrade
Guide
Upgrading
System
Memory
This
section explains
how
to
install
system
memory
There
are
instructions
on
how
to
configure
and
install
memory
and
an
expla-
nation
of
the
technical
specifications
required.
System
DRAM
is
the
main
source
of
data
for
the
CPU.
Data
re-
mains
stored
in
DRAM
as
long
as
the
system
is
turned
on,
and
is
lost
when
you
turn
it
off.
The
Level
2
cache
memory
is
Static
RAM
(SRAM),
which
is
faster
than
DRAM
memory.
When
the
CPU
looks
for
data,
it
first
searches
the
cache.
If
the
information
is
not
there,
the
search
continues
in
the
DRAM.
With
this
design,
the
CPU
looks
in
the
fastest
source
of
data
first,
which
lets
it
operate
as
fast
as
possible.
The
DRAM
subsystem
uses
memory
chips
permanently
mounted
on
small
circuit
boards
to
form
"SIMMs"
(Single
In
-line
Memory
Modules).
The
memory
chips
have
a
speed
rating
that
is
measured
in
nanoseconds
(ns).
This
mainboard
requires
either
Fast
Page
Mode
(FPM)
DRAM
or
Extended
Data
Output
(EDO)
DRAM
with
a
speed
of
at
least
60
or
70ns
depending
on
the
bus
clock/CPU
external
clock
speed
setting.
This
mainboard
can
use
72
-pin
SIMMs
in
four
sizes
from
4IVIB
up
to
32MB
(megabytes).
Depending
on
the
combination
of
modules
you
use,
you
can
install
between
8MB
and
128MB.
The
32
-bit
modules
used
for
this
board
come
with
memory
chips
on
either
one
or
both
sides
of
the
module.
2
-
5