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Type 6866 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:
RIMM connectors do not support dual inline memory
modules (DIMMs)
Use only PC600 or PC800 RIMMs.
There are four or eight RIMM memory cards. RIMMs
must be installed in pairs. The RIMMs installed in a
RIMM connector pair must be of the same speed, and
size.
For four RIMM cards, any connector that does not
have a RIMM installed must have a
continuity RIMM
(C-RIMM).
For eight RIMM cards, pairs 1 and 3 must have
RIMMs or C-RIMMs installed in them. If RIMMs are
installed in pair 2, RIMMs or C-RIMMs must be
installed in pair 4. For the arrangement of the RIMM
connector pairs on the computer memory card, see
the illustration on page 157.
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.
Eight RIMM Memory card configuration
2 RIMMs
4 RIMMs
4 RIMMs*
6 RIMMs
8 RIMMs
1
(1)
C-RIMM
(1)
RIMM
C-RIMM
Pair 1
Note:
*
(1)
Memory must be installed in matched pairs.
Non-optimal performance configuration
These connectors may either be left empty or used to store c-rimms.
Memory placement for 8-RIMM Memory Card
2
(1)
RIMM
(1)
RIMM
RIMM
3
RIMM
RIMM
RIMM
C-RIMM
C-RIMM
4
RIMM
RIMM
RIMM
RIMM
RIMM
5
RIMM
RIMM
RIMM
RIMM
RIMM
7
(1)
RIMM
(1)
RIMM
RIMM
6
RIMM
RIMM
RIMM
C-RIMM
C-RIMM
8
(1)
(1)
RIMM
C-RIMM
C-RIMM
Pair 3
Pair 2
Pair 4
Four RIMM memory card configuration
158 IBM PC 300/IntelliStation Vol 3 HMM