-
An
Ultra320
twisted
ribbon
cable
connects
the
internal
Ultra320
SCSI
hard
disk
drive
to
the
SCSI
connector
on
the
system
board.
This
cable
has
four
additional
connectors
for
attaching
more
internal
SCSI
devices.
-
A
round
SCSI
cable
connects
external
SCSI
devices
to
the
integrated
SCSI
controller
(SCSI
B)
on
the
system
board.
For
more
information
about
connecting
SCSI
devices,
see
the
SCSI
documentation.
Replacing
memory
modules
The
following
notes
describe
the
types
of
dual
inline
memory
modules
(DIMMs)
that
the
computer
supports
and
other
information
that
you
must
consider
when
installing
DIMMs:
v
The
computer
must
have
at
least
one
pair
of
DIMMs
installed
in
the
DIMM
connectors
for
each
microprocessor
installed.
v
The
system
board
contains
four
DIMM
connectors
for
microprocessor
1.
The
computer
comes
with
one
pair
of
DIMMs
installed
in
the
DIMM
connectors
on
the
system
board.
v
If
you
install
a
second
microprocessor,
the
board
that
comes
with
the
microprocessor
option
(microprocessor
board)
contains
four
DIMM
connectors
for
microprocessor
2.
You
must
install
at
least
one
pair
of
DIMMs
in
the
DIMM
connectors
on
the
microprocessor
board.
v
You
can
add
a
second
pair
of
DIMMs
for
either
microprocessor
at
any
time.
It
is
not
necessary
to
add
a
second
pair
of
DIMMs
for
microprocessor
1
before
adding
a
second
pair
of
DIMMs
for
microprocessor
2.
v
The
DIMM
options
that
are
available
for
the
computer
are
512
MB,
1
GB,
and
2
GB.
The
computer
supports
a
minimum
of
1
GB
and
a
maximum
of
16
GB
of
system
memory.
Exception:
Although
the
computer
supports
a
maximum
of
16
GB
of
system
memory,
the
Microsoft
Windows
XP
operating
systems
recognize
and
support
a
maximum
of
4
GB
of
system
memory.
v
The
computer
comes
with
two
512
MB
or
1
GB
memory
DIMMs
installed.
v
Install
only
2.5
V,
184-pin,
double-data-rate
(DDR),
PC3200,
registered,
buffered
synchronous
dynamic
random-access
memory
(SDRAM)
with
error
correcting
code
(ECC)
DIMMs.
These
DIMMs
must
be
compatible
with
the
latest
PC3200
SDRAM
buffered
DIMM
specification.
For
a
list
of
supported
options
for
the
computer,
go
to
http://www.ibm.com/pc/;
then,
select
your
country
and
navigate
to
the
list
of
options
for
the
computer.
v
DIMMs
must
be
installed
in
matched
pairs.
The
DIMMs
in
each
pair
must
be
the
same
size,
speed,
type,
and
technology
as
each
other
but
do
not
have
to
match
other
pairs.
You
can
mix
compatible
DIMMs
from
various
manufacturers.
v
The
first
pair
of
DIMMs
on
the
system
board
are
installed
in
DIMM
connectors
1
and
2.
If
you
install
a
second
pair
of
DIMMs
for
microprocessor
1,
install
the
pair
in
DIMM
connectors
3
and
4.
Table
2
shows
the
system
board
DIMM
installation
sequence.
Table
2.
DIMM
installation
sequence
on
system
board
Installation
sequence
on
system
board
DIMMs
Slots
First
pair
of
DIMMs
1,
2
Second
pair
of
DIMMs
3,
4
Chapter
4.
Customer
replaceable
units
45
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