IBM 6223, 6227 manual 42

Important: Although the computer supports a maximum of 8 GB of system
memory, the Microsoft Windows operating systems recognize and
support a maximum of 4 GB of system memory.
vThe memory controller in the computer provides Chipkill memory protection if the
DIMMs are 1 GB or larger, or if the computer is populated with 512 MB x4
DIMMs. Chipkill memory protection is a technology that protects the computer
from a single chip failure on a DIMM.
vThe amount of usable memory is reduced depending on the system
configuration. Acertain amount of memory must be reserved for system
resources. The BIOS displays the total amount of installed memory and the
amount of configured memory.
Complete the following steps to install DIMMs:
1. Read the safety information beginning on page 127 and “Handling
static-sensitive devices” on page 23
2. Turn off the computer and all attached devices (see “Turningoff the computer”
on page 9); then, disconnect all power cords and external cables.
3. Remove the side cover (see “Removing the side cover” on page 25).
4. Locate the DIMM connectors on the system board. Determine the connectors
into which you will install the DIMMs. See Table2 on page 41 for additional
information on DIMM-installation sequences.
Table3. DIMM installation sequence
DIMM pair DIMM connectors
First pair 1, 2
Second pair 3, 4
Third pair 5, 6
5. Gently open the retaining clip, if necessary, remove any existing DIMM.
6. Touchthe static-protective package containing the DIMM to any unpainted
metal surface on the computer. Then, remove the new DIMM from the
package.
7. Gently open the retaining clip on each end of the DIMM slot. Turn the DIMM
so that the pins align correctly with the connector.
42 IntelliStation Z Pro Types6223 and 6227: HardwareMaintenance Manual and Troubleshooting Guide