Lenovo NetVista Hardware Maintenence Manual for Netvista 6838 and 6848 systems - Page 48

System board memory, Rambus inline memory modules RIMMs

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System board memory RIMM connector 1 RIMM connector 2 RIMM connector 3 RIMM connector 4 Retaining clip Rambus inline memory modules (RIMMs) The IBM-installed RIMMs are ECC (error checking and correction) RDRAM (Rambus dynamic random access memory) modules. When installing or replacing RIMMs, take the following information into consideration: v RIMM connectors do not support dual inline memory modules (DIMMs) v Use only PC600 or PC800 RIMMs. v RIMMs must be installed in pairs. The RIMMs installed in a RIMM connector pair must be of the same speed, and size. v Any connector that does not have a RIMM installed must have a continuity RIMM (C-RIMM). v Install only ECC RIMMS to enable ECC. If ECC and non-ECC memory are used together, the memory will function as non-ECC memory. Note: If PC600 and PC800 RIMMs are used together, all memory will function at the speed of the slowest RIMM. Memory placement for 4-RIMM Memory Card Pair 1 Pair 2 1 2 3 4 2 RIMMs RIMM RIMM C-RIMM C-RIMM 4 RIMMs RIMM RIMM RIMM RIMM Note: Memory must be installed in matched pairs. The following matrix cross-references the name of the computer (printed on the logo) and the size, speed, and type of memory modules supported in the computer. 40 IBM NetVista Type 6838, 6848: Hardware Maintenance Manual

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System board memory
RIMM connector 1
RIMM connector 2
RIMM connector 3
RIMM connector 4
Retaining clip
Rambus inline memory modules (RIMMs)
The IBM-installed RIMMs are ECC (error checking and correction) RDRAM
(Rambus dynamic random access memory) modules.
When installing or replacing RIMMs, take the following information into
consideration:
v
RIMM connectors do not support dual inline memory modules (DIMMs)
v
Use only PC600 or PC800 RIMMs.
v
RIMMs must be installed in pairs. The RIMMs installed in a RIMM connector
pair must be of the same speed, and size.
v
Any connector that does not have a RIMM installed must have a
continuity
RIMM
(C-RIMM).
v
Install only ECC RIMMS to enable ECC. If ECC and non-ECC memory are used
together, the memory will function as non-ECC memory.
Note:
If PC600 and PC800 RIMMs are used together, all memory will function at
the speed of the slowest RIMM.
Memory placement for 4-RIMM Memory Card
2 RIMMs
4 RIMMs
4
RIMM
C-RIMM
3
C-RIMM
RIMM
1
RIMM
RIMM
2
RIMM
RIMM
Note:
Memory must be installed in matched pairs.
Pair 1
Pair 2
The following matrix cross-references the name of the computer (printed on the
logo) and the size, speed, and type of memory modules supported in the
computer.
40
IBM NetVista Type 6838, 6848: Hardware Maintenance Manual