IBM 8649 Hardware Maintenance Manual - Page 65

Installing, memory, modules

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the maximum cable length that supports Ultra320 SCSI hard disk drives is 16 inches. For more information about connecting SCSI devices, see the SCSI documentation. Installing memory modules You can increase the amount of memory in your server by installing memory modules. Your server uses industry-standard PC2100 double-data-rate (DDR) dual inline memory modules (DIMMs). Notes: 1. The system board contains four DIMM connectors and supports two-way memory interleaving. 2. The DIMM options available for your server are 128 MB, 256 MB, 512 MB, 1 GB, and 2 GB. Your server supports a minimum of 256 MB and a maximum of 8 GB of system memory. 3. The amount of usable memory will be reduced depending on the system configuration. A certain amount of memory must be reserved for system resources. The BIOS will display the total amount of installed memory and the amount of configured memory. 4. Your server comes with two 256 MB or 512 MB DIMMs (for a total of 512 MB or 1024 MB) installed in the DIMM 3 and DIMM 4 memory connectors. When you install additional DIMMs, be sure to install them as a pair in DIMM connectors 1 and 2. 5. DIMMs must be installed in matched pairs. The first pair of DIMMs you install in DIMM 3 and DIMM 4 memory connectors must be the same size, speed, type, and technology. You can mix compatible DIMMs from various manufacturers. If you install a second pair of DIMMs in DIMM 1 and DIMM 2 memory connectors, they do not have to be the same size, speed, type, and technology as the DIMMs you installed in DIMM 3 and DIMM 4 memory connectors. However, the size, speed, type, and technology of the DIMMs you install in DIMM 1 and DIMM 2 memory connectors must match each other. 6. Install only 133 MHz (memory bus), 2.5 V, 184-pin, double-data-rate (DDR), PC2100, registered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest PC2100 SDRAM Registered DIMM specification. For a list of supported options for your server, go to http://www.ibm.com/servers/eserver/ serverproven/compat/us/ on the World Wide Web. 7. Your server supports Chipkill™ memory if the DIMMs are all type x4 and are 512 MB or larger. Your server also supports Chipkill memory if two 256 MB DIMMs and two 512 MB DIMMs are installed; however, only the 512 MB DIMMs provide Chipkill memory support. All 128 MB DIMMs, 256 MB DIMMs, or DIMMs that are not type x4 do not provide Chipkill memory support. Complete the following steps to install a DIMM: 1. Review the safety information beginning on page 129 "Installation guidelines" on page 33, and "Handling static-sensitive devices" on page 34. 2. Turn off the server and disconnect all power cords and external cables; then, remove the side cover (see "Removing the side cover" on page 36). 3. Remove the support bracket (see "Removing and installing the support bracket" on page 38). 4. Locate the DIMM connectors on the system board. Determine the connectors into which you will install the DIMMs. Install the DIMMs in the order shown in the following table. Chapter 4. Installing options 55

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the
maximum
cable
length
that
supports
Ultra320
SCSI
hard
disk
drives
is
16
inches.
For
more
information
about
connecting
SCSI
devices,
see
the
SCSI
documentation.
Installing
memory
modules
You
can
increase
the
amount
of
memory
in
your
server
by
installing
memory
modules.
Your
server
uses
industry-standard
PC2100
double-data-rate
(DDR)
dual
inline
memory
modules
(DIMMs).
Notes:
1.
The
system
board
contains
four
DIMM
connectors
and
supports
two-way
memory
interleaving.
2.
The
DIMM
options
available
for
your
server
are
128
MB,
256
MB,
512
MB,
1
GB,
and
2
GB.
Your
server
supports
a
minimum
of
256
MB
and
a
maximum
of
8
GB
of
system
memory.
3.
The
amount
of
usable
memory
will
be
reduced
depending
on
the
system
configuration.
A
certain
amount
of
memory
must
be
reserved
for
system
resources.
The
BIOS
will
display
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory.
4.
Your
server
comes
with
two
256
MB
or
512
MB
DIMMs
(for
a
total
of
512
MB
or
1024
MB)
installed
in
the
DIMM
3
and
DIMM
4
memory
connectors.
When
you
install
additional
DIMMs,
be
sure
to
install
them
as
a
pair
in
DIMM
connectors
1
and
2.
5.
DIMMs
must
be
installed
in
matched
pairs.
The
first
pair
of
DIMMs
you
install
in
DIMM
3
and
DIMM
4
memory
connectors
must
be
the
same
size,
speed,
type,
and
technology.
You
can
mix
compatible
DIMMs
from
various
manufacturers.
If
you
install
a
second
pair
of
DIMMs
in
DIMM
1
and
DIMM
2
memory
connectors,
they
do
not
have
to
be
the
same
size,
speed,
type,
and
technology
as
the
DIMMs
you
installed
in
DIMM
3
and
DIMM
4
memory
connectors.
However,
the
size,
speed,
type,
and
technology
of
the
DIMMs
you
install
in
DIMM
1
and
DIMM
2
memory
connectors
must
match
each
other.
6.
Install
only
133
MHz
(memory
bus),
2.5
V,
184-pin,
double-data-rate
(DDR),
PC2100,
registered
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC)
DIMMs.
These
DIMMs
must
be
compatible
with
the
latest
PC2100
SDRAM
Registered
DIMM
specification.
For
a
list
of
supported
options
for
your
server,
go
to
serverproven/compat/us/
on
the
World
Wide
Web.
7.
Your
server
supports
Chipkill
™
memory
if
the
DIMMs
are
all
type
x4
and
are
512
MB
or
larger.
Your
server
also
supports
Chipkill
memory
if
two
256
MB
DIMMs
and
two
512
MB
DIMMs
are
installed;
however,
only
the
512
MB
DIMMs
provide
Chipkill
memory
support.
All
128
MB
DIMMs,
256
MB
DIMMs,
or
DIMMs
that
are
not
type
x4
do
not
provide
Chipkill
memory
support.
Complete
the
following
steps
to
install
a
DIMM:
1.
Review
the
safety
information
beginning
on
page
129
“Installation
guidelines”
on
page
33,
and
“Handling
static-sensitive
devices”
on
page
34.
2.
Turn
off
the
server
and
disconnect
all
power
cords
and
external
cables;
then,
remove
the
side
cover
(see
“Removing
the
side
cover”
on
page
36).
3.
Remove
the
support
bracket
(see
“Removing
and
installing
the
support
bracket”
on
page
38).
4.
Locate
the
DIMM
connectors
on
the
system
board.
Determine
the
connectors
into
which
you
will
install
the
DIMMs.
Install
the
DIMMs
in
the
order
shown
in
the
following
table.
Chapter
4.
Installing
options
55