IBM 306m User Guide - Page 38

random-access - specifications

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the DIMM that is installed in DIMM connector 1. You can mix compatible DIMMs from various manufacturers. The third and fourth DIMMs must be installed as a pair, in DIMM connectors 2 and 4. v If you install a pair of DIMMs in DIMM connectors 2 and 4, they do not have to be the same size, speed, type, and technology as the DIMMs that are installed in DIMM connectors 1 and 3. However, the size, speed, type, and technology of the DIMMs that you install in DIMM connectors 2 and 4 must match each other. v Install only 1.8 V, 240-pin, double-data-rate II (DDR II), PC4200, unbuffered synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) DIMMs. These DIMMs must be compatible with the latest PC4200 SDRAM unbuffered DIMM specification. v If you install a pair of 2 GB DIMMs and a pair of other-size DIMMs, the 2 GB DIMMs must be installed as the first pair (in DIMM connectors 1 and 3). v When you restart the server after adding or removing a DIMM, a message is displayed indicating that the memory configuration has changed. To remove a DIMM, complete the following steps: 1. Read the safety information that begins on page v and "Installation guidelines" on page 17. 2. Turn off the server and peripheral devices, and disconnect the power cord and all external cables. Remove the cover (see "Removing the cover" on page 18). Attention: To avoid breaking the retaining clips or damaging the DIMM connectors, open and close the clips gently. 3. Open the retaining clip on each end of the DIMM connector. 4. Lift the DIMM out of the connector. To install a DIMM, complete the following steps: 1. Read the safety information that begins on page v and "Installation guidelines" on page 17. 2. Turn off the server and peripheral devices, and disconnect the power cord and all external cables. Remove the cover (see "Removing the cover" on page 18). Attention: To avoid breaking the retaining clips or damaging the DIMM connectors, open and close the clips gently. 3. Open the retaining clip on each end of the DIMM connector. 26 IBM xSeries 306m Types 8849 and 8491: User's Guide

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the
DIMM
that
is
installed
in
DIMM
connector
1.
You
can
mix
compatible
DIMMs
from
various
manufacturers.
The
third
and
fourth
DIMMs
must
be
installed
as
a
pair,
in
DIMM
connectors
2
and
4.
v
If
you
install
a
pair
of
DIMMs
in
DIMM
connectors
2
and
4,
they
do
not
have
to
be
the
same
size,
speed,
type,
and
technology
as
the
DIMMs
that
are
installed
in
DIMM
connectors
1
and
3.
However,
the
size,
speed,
type,
and
technology
of
the
DIMMs
that
you
install
in
DIMM
connectors
2
and
4
must
match
each
other.
v
Install
only
1.8
V,
240-pin,
double-data-rate
II
(DDR
II),
PC4200,
unbuffered
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC)
DIMMs.
These
DIMMs
must
be
compatible
with
the
latest
PC4200
SDRAM
unbuffered
DIMM
specification.
v
If
you
install
a
pair
of
2
GB
DIMMs
and
a
pair
of
other-size
DIMMs,
the
2
GB
DIMMs
must
be
installed
as
the
first
pair
(in
DIMM
connectors
1
and
3).
v
When
you
restart
the
server
after
adding
or
removing
a
DIMM,
a
message
is
displayed
indicating
that
the
memory
configuration
has
changed.
To
remove
a
DIMM,
complete
the
following
steps:
1.
Read
the
safety
information
that
begins
on
page
v
and
“Installation
guidelines”
on
page
17.
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cord
and
all
external
cables.
Remove
the
cover
(see
“Removing
the
cover”
on
page
18).
Attention:
To
avoid
breaking
the
retaining
clips
or
damaging
the
DIMM
connectors,
open
and
close
the
clips
gently.
3.
Open
the
retaining
clip
on
each
end
of
the
DIMM
connector.
4.
Lift
the
DIMM
out
of
the
connector.
To
install
a
DIMM,
complete
the
following
steps:
1.
Read
the
safety
information
that
begins
on
page
v
and
“Installation
guidelines”
on
page
17.
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cord
and
all
external
cables.
Remove
the
cover
(see
“Removing
the
cover”
on
page
18).
Attention:
To
avoid
breaking
the
retaining
clips
or
damaging
the
DIMM
connectors,
open
and
close
the
clips
gently.
3.
Open
the
retaining
clip
on
each
end
of
the
DIMM
connector.
26
IBM
xSeries
306m
Types
8849
and
8491:
User’s
Guide