IBM Xseries 345 8670 Maintenance Manual page 69

3. The amount of usable memory will be reduced depending on the system
configuration. The BIOS will display the total amount of installed memory and
the amount of configured memory.
4. Your server supports a minimum of two 256 MB DIMMs (for a total of 512 MB)
installed in the DIMM 1 and DIMM 2 memory connectors (J1 and J2,
respectively). When you install additional DIMMs, install them in pairs, with the
next pair in DIMM connectors 3 and 4 (J3 and J4).
5. Both DIMMs in a pair must be the same size, speed, type, and technology. You
can mix compatible DIMMs from various manufacturers.
6. The second pair of DIMMs do not have to be the same size, speed, type, and
technology as the first pair.
7. Install only 100 MHz, 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 (and downward compatible with PC1600) SDRAM Registered DIMM
specification, which is available from http://www.jedec.org/ on the World Wide
Web. For a list of supported options for your server, go to
http://www.ibm.com/us/compat/ on the World Wide Web.
8. Your server supports Chipkill technology, if the DIMMs are all of the type 4x and
are larger than 128 MB.
9. Save new configuration information only if you replace a faulty DIMM that was
marked as Disabled in the Configuration/Setup Utility program Memory
Settings menu. In this case, re-enable the memory row in the
Configuration/Setup Utility program or reload the default memory settings. See
Chapter 2, "Configuring your server", on page 9 for more information.
Install the DIMMs in the order shown in the following table:
Table 8. DIMM order of installation
Pair
First
Second
The following illustration shows how to install DIMMs on the system board.
DIMM 3 (J3)
DIMM 4 (J4)
DIMM connectors
1 and 2 (J1, J2)
3 and 4 (J3, J4)
DIMM 1 (J1)
DIMM 2 (J2)
Chapter 4. Customer replaceable units
59