Specifications

Memory Placement for a Memory Riser Card
Memory riser cards can be populated with up to four
quads
. Each quad is a group of
four DIMMs; the quads are labeled A, B, C, and D. The following rules apply to DIMM
placement on a memory riser card:
v Each memory quad must contain four DIMMs of equal memory size.
v Quad memory size may be mixed on a memory riser card.
v The minimum memory is four DIMMs installed in quad A, as shown in the following
figure:
(15) A
(16) A
(14) B
(12) C
(10) D
(8) D
(6) C
(4) B
(2) A
(13) B
(11) C
(9) D
(7) D
(5) C
(3) B
(1) A
v To increase memory, add more quads to a memory riser card or replace the DIMMs
in a quad with DIMMs of a larger size.
v Populate the memory riser card starting with quad A and continuing with quads B, C,
and D as shown above.
Memory DIMMs
Removing Memory DIMMs
1. If you have not already done so, shut down the system as described in “Stopping
the System Unit” on page 306.
2. If you have not already done so, unplug the system unit power cable from the
electrical outlet.
3. If you have not already done so, remove the covers as described in “Removing the
Covers” on page 301.
4. If you have not already done so, remove the processor and memory riser card
cover as described in “Removing Processor and Memory Riser Card Cover” on
page 305.
5. If you have not already done so, remove the memory riser card as described in
“Removing a Memory Riser Card or One-Way Processor Card” on page 332.
336 Service Guide