Installation guide

3-17
Installing Options
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:
• Each memory quad must contain four DIMMs of equal memory value.
• Quad memory size may be mixed on a memory riser card.
• 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
• To increase memory, add more quads to a memory riser card or replace the DIMMs in a
quad with DIMMs of a larger size.
• Populate the memory riser card starting with quad A and continuing with quads B, C, and
D as shown above.
Installing Memory DIMMs
1. If you have not already done so, shutdown the system as described in ”Stopping the
System Unit” on page 3-2.
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 3-4.
4. If you have not already done so, remove the processor and memory card cover as
described in ”Removing Processor and Memory Card Cover” on page 3-6.
5. If you have not already done so, remove the memory card as described in ”Removing a
Memory Card or One–Way Processor Card” on page 3-20.
Note: If your system has a one–way processor card installed, the memory may be installed
on this card. Remove the processor card to upgrade the memory. See ”Removing a
Memory Card or One–Way Processor Card” on page 3-20.
6. With one hand, touch any metal surface of the chassis to minimize static electrical
charges, and then pick up the memory DIMM.