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Supported DIMMs
Your blade server contains connectors for registered dual inline memory modules (RDIMMs).
Each system board in the PS703 or PS704 blade server contains 16 very low profile (VLP) memory
connectors for DIMMs. The PS704 supports up to 32 DIMMs. The maximum size for a single DIMM is 8
GB. The maximum memory capacity for a PS703 server is 128 GB. The maximum memory capacity for a
PS704 server is 256 GB.
See Chapter 3, "Parts listing, type 7891," on page 225 for memory modules that you can order from IBM.
Memory module rules:
v Install DIMM fillers in unused DIMM slots for proper cooling.
v Install DIMMs in pairs (1 and 4, 5 and 8, 9 and 12, 13 and 16, 2 and 3, 6 and 7, 10 and 11, and 14 and
15).
v Both DIMMs in a pair must be the same size, speed, type, and technology. You can mix compatible
DIMMs from different manufacturers.
v Each DIMM within a processor-support group (1-4, 5-8, 9-12, 13-16) must be the same size and speed.
v Install only supported DIMMs, as described on the ServerProven
03.ibm.com/servers/eserver/serverproven/compat/us/.
v Installing or removing DIMMs changes the configuration of the blade server. After you install or
remove a DIMM, the blade server is automatically reconfigured, and the new configuration information
is stored.
v See "System-board connectors" on page 9 for DIMM connector locations.
Table 1 shows allowable placements of DIMM modules for the PS703 blade server. Table 2 on page 5
shows allowable placements of DIMM modules for the PS704 blade server.
Table 1. Memory module combinations for the PS703 blade server
DIMM
count
1
2
3
2
X
4
X
6
X
8
X
10
X
X
X
12
X
X
X
14
X
X
X
16
X
X
X
4
Power Systems: Problem Determination and Service Guide for the IBM PS703 (7891-73X) and PS704 (7891-74X)
PS703 DIMM slots
4
5
6
7
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
®
website. See http://www-
8
9
10
11
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
12
13
14
15
X
X
X
X
X
X
X
X
X
X
X
X
X
X
16
X
X
X
X
X
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