IBM IntelliStation A Pro 6217 Service Manual page 117

v The first pair of DIMMs on the system board are installed in DIMM connectors 1
and 2. If you install a second pair of DIMMs for microprocessor 1, install the pair
in DIMM connectors 3 and 4. Table 7 shows the system board DIMM installation
sequence.
Table 7. DIMM installation sequence on system board
DIMMs
First pair of DIMMs
Second pair of DIMMs
v If you install a second microprocessor (microprocessor 2), install the first pair of
DIMMs for the microprocessor in DIMM connectors 5 and 6 on the
microprocessor board. If you install a second pair of DIMMs for the
microprocessor, install the pair in DIMM connectors 7 and 8 on the
microprocessor board. See "Replacing the second microprocessor
(microprocessor 2 and fan sink)" on page 117 for more information about the
microprocessor option. Table 8 shows the microprocessor board DIMM
installation sequence.
Table 8. DIMM installation sequence on microprocessor board
Installation sequence on microprocessor board
DIMMs
First pair of DIMMs
Second pair of DIMMs
v The computer supports two-way memory interleaving across the memory banks
for each microprocessor.
v The amount of usable memory will be reduced depending on the system
configuration. A certain amount of memory must be reserved for system
resources. The BIOS will display the total amount of installed memory and the
amount of configured memory. To obtain a full 16 GB or more of usable memory,
you must install a second microprocessor and memory.
v When you restart the computer after adding or removing DIMMs, the computer
displays a message that the memory configuration has changed.
To install a pair of DIMMs, complete the following steps:
1. Read the safety information that begins on page vii and "Installation guidelines"
on page 79.
2. Turn off the computer and all attached devices; then, disconnect all external
cables and power cords.
3. Remove the side cover (see "Removing the side cover" on page 81).
4. Remove the support bracket (see "Removing the support bracket" on page 83).
5. For easier access to the memory modules on the system board, rotate the
drive cage out of the computer until it locks into place. You might need to
disconnect the power cables from the drives before you rotate the cage all the
way.
Note: If you are installing memory modules on the microprocessor board for a
second microprocessor on the computer, it is not necessary to move the drive
cage.
Installation sequence on system board
Chapter 4. Removing and replacing computer components
Slots
1, 2
3, 4
Slots
5, 6
7, 8
101