System Board Memory - IBM NetVista Hardware Maintenance Manual

System board memory

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
v Any connector that does not have a RIMM installed must have a continuity
v Install only ECC RIMMS to enable ECC. If ECC and non-ECC memory are used
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
pair must be of the same speed, and size.
RIMM (C-RIMM).
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
1 2
2 RIMMs RIMM RIMM C-RIMM
4 RIMMs RIMM RIMM
Note: Memory must be installed in matched pairs.
RIMM connector 1
RIMM connector 2
RIMM connector 3
RIMM connector 4
Retaining clip
Pair 2
3 4
C-RIMM
RIMM RIMM