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RIMM pairing is as follows:
v Pair 1 includes RIMM 1 and RIMM 2.
v Pair 2 includes RIMM 3 and RIMM 4.
v Pair 3 includes RIMM 5 and RIMM 6.
v Pair 4 includes RIMM 7 and RIMM 8.
When installing or replacing RIMMs, note the following:
v The memory board in the computer has eight RIMM connectors arranged in
v The memory board in the computer has eight RIMM connectors, pairs 1 and 2
v C-RIMMs (termination card) must be populated for unused RIMM slots within the
v C-RIMMs are not needed if the RIMM connectors of the paired channel do not
v Install only ECC RIMMS to enable ECC.
v Do not mix RIMM speed, technologies, density, non-ECC and ECC memory
v RIMM connectors do not support dual inline memory modules (DIMMs).
v Use only PC800, 400 MHz RIMMs.
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Hardware Maintenance Manual: IBM IntelliStation M Pro Type 6233 and 6850
pairs. RIMMs must be installed in matched pairs. This means that the RIMMs
installed in a RIMM connector pair must be the same speed, size, and
technology. For example, you can install a pair of 144Mbit, ECC, 400MHz, 128
MB RIMMs in RIMM 1 and RIMM 2 slots. You cannot install a pair that has one
144Mbit, ECC, 400MHz, 128 MB RIMM in RIMM 1 and one 288Mbit, ECC,
400MHz, 256 MB RIMM in RIMM 2, or vice versa. When you want to upgrade
with another pair of RIMMs, you can install either a pair of 128 MB RIMMs, a pair
of 256 MB RIMMs, or a pair of 512 MB RIMMs (as long as they are of the same
speed, size, and technologies).
must have RIMMs or continuity RIMMs (C-RIMMs) installed in them. For the
arrangement of the RIMM connector pairs on the computer memory board, see
the following table.
Refer to the following sequence examples for upgrading memory. For these
examples, we use 144Mbit, ECC, 400MHz, 128 MB, 256 MB, and 512 memory
modules:
Sequence 1
The computer is shipped with a pair of 128 MB RIMMs installed in RIMM
1 and RIMM 2 connectors and a pair of C-RIMMs installed in RIMM 3
and RIMM 4. All other RIMM connectors are empty.
Sequence 2
The first upgrade with a pair of 256 MB RIMMs. Remove the C-RIMMs
from RIMM 3 and RIMM 4 connectors, and insert them in RIMM 7 and
RIMM 8 connectors. Install the new pair of RIMMs in RIMM 3 and RIMM
4 connectors. RIMM 5 and RIMM 6 connectors remain empty.
Sequence 3
The second upgrade with a pair of 512 MB RIMMs. Remember, you can
mix and match memory modules as long as a pair is of the same size,
speed, and technology. Install the pair of 512 MB RIMMs in RIMM 5 and
RIMM 6 connectors. No other changes need to be made.
Sequence 4
The third upgrade with a pair of 128 MB RIMMs. Remove the C-RIMMs
from RIMM 7 and RIMM 8 (keep the C-RIMMs for future use). Install the
new pair of RIMMs into RIMM 7 and RIMM 8 connectors.
same paired channel.
populate any RIMMs.
within a pair of RIMMs. This is not supported.
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