Lenovo RD120 manual Installing a memory module, Pair, DIMM connectors

Installing a memory module

The following notes describe the types of dual inline memory modules (DIMMs) that the server supports and other information that you must consider when installing DIMMs:

vThe server supports up to 12 Fully Buffered DIMM PC2-5300 512 MB, 1 GB, 2 GB, and 4 GB DIMMs, for a maximum of 48 GB of system memory. See http://www.lenovo.com/thinkserver/ for a list of memory modules that you can use with the server.

Note: Because some memory is reserved for system operation, the actual usable memory size that is reported by the operating system is less than the total installed size.

vThe server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and 4. When you install additional DIMMs, you must install two identical DIMMS at a time, in the order shown in the following table, to maintain performance.

Table 3. DIMM installation sequence

Pair DIMM connectors

11 and 4

27 and 10

32 and 5

48 and 11

53 and 6

69 and 12

Note: When only one pair of DIMMs is installed in the server and the BIOS code level is version 1.04 (GGE127A) or later, you can improve performance by installing the DIMMs in connectors 1 and 7 instead of 1 and 4. However, because the connectors in the pair are not on the same memory branch (see the following illustration), Advanced ECC memory protection is disabled.

60ThinkServer RD120 Types 6444, 6445, 6446, and 6447: User Guide