1. the system board contains four dimm connectors and supports two-way memory interleaving.
2. the dimm options available for your computer are 128 mb, 256 mb, 512 mb, 1 gb, and 2 gb. your computer supports a minimum of 256 mb and a maximum of 8 gb of system memory.
3. 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.
4. your computer comes with two 256 mb or 512 mb dimms (for a total of 512 mb or 1024 mb) installed in the dimm 3 and dimm 4 memory connectors. when you install additional dimms, be sure to install them as a pair in dimm connectors 1 and 2.
5. dimms must be installed in matched pairs. the first pair of dimms you install in dimm 3 and dimm 4 memory connectors must be the same size, speed, type, and technology. you can mix compatible dimms from various manufacturers. if you install a second pair of dimms in dimm 1 and dimm 2 memory connectors, they do not have to be the same size, speed, type, and technology as the dimms you installed in dimm 3 and dimm 4 memory connectors. however, the size, speed, type, and technology of the dimms you install in dimm 1 and dimm 2 memory connectors must match each other.
6. install only 133 mhz (memory bus), 2.5 v, 184-pin, double-data-rate (ddr), pc2100, registered synchronous dynamic random-access memory (sdram) with error correcting code (ecc) dimms. these dimms must be compatible with the latest pc2100 sdram registered dimm specification. for a list of supported options for your computer, go to http://www.ibm.com/pc/ on the world wide web; then, select your country and navigate to the list of options for your computer.
7. your computer supports chipkill memory if the dimms are all type x4 and are 256 mb or larger. using any 128 mb dimms or dimms that are not type x4 on your computer disables chipkill memory.
complete the following steps to install a dimm:
1. review the safety information beginning on page vii, “installation guidelines” on page 27, and “handling static-sensitive devices” on page 28.
2. turn off the computer and all attached devices.
3. disconnect all power cords; then disconnect all external cables.
4. remove the side cover (see “removing the side cover” on page 31).
5. remove the support bracket (see “removing and installing the support bracket” on page 33).
6. you might find it easier to install memory modules if you rotate the drive cage out of the computer. grasp the drive cage and rotate until it locks into place. see the illustration on page 42 for additional information.
7. locate the dimm connectors on the system board. determine the connectors into which you will install the dimms. install the dimms in the order shown in the following table.
table 2. dimm installation sequence
8. open the retaining clips and, if necessary, remove any existing dimm.
9. touch the static-protective package containing the dimm to any unpainted metal surface on the computer. then remove the new dimm from the package.
10. gently open the retaining clip on each end of the dimm slot. turn the dimm so that the pins align correctly with the connector.
11. insert the dimm into the connector. firmly press the dimm straight down into the connector by applying pressure on both ends of the dimm simultaneously.
the retaining clips snap into the locked position when the dimm is firmly seated in the connector. if there is a gap between the dimm and the retaining clips, the dimm has not been correctly installed. open the retaining clips, remove the dimm, then reinsert it.
12. if you have other options to install or remove, do so now.
13. push the drive cage outward, and press in on the drive-cage release tab; then, rotate the cage back into the computer.
14. replace the support bracket (see “removing and installing the support bracket” on page 33).
15. replace the side cover (see “replacing the side cover” on page 53).
16. reconnect the external cables and power cords. turn on the attached devices, and turn on the computer.