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Supported DIMMs
Each planar in the JS23 and the JS43 blade server contains eight very low profile
(VLP) memory connectors for registered dual inline memory modules (RDIMMs).
The total memory capacity ranges from a minimum of 4 GB to a maximum of 64
GB for a JS23 blade server, and from a minimum of 4 GB to a maximum of 128 GB
for the JS43 double-wide blade server.
See the "Parts Listing" in the online information center or in the Problem
Determination and Service Guide 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 3, 6 and 8, 2 and 4, 5 and 7 for the JS23; plus 9
v Both DIMMs in a pair must be the same size, speed, type, and technology. You
v Each DIMM within a processor-support group (1-4, 5-8, 9-12, and 13-16) must be
v Install only supported DIMMs, as described on the ServerProven Web site. See
v Installing or removing DIMMs changes the configuration of the blade server.
v See "System-board connectors" on page 17 for DIMM connector locations.
Table 5 shows allowable placement of DIMM modules:
Table 5. Memory module combinations
JS23 Base blade planar (P1) DIMM slots
DIMM
count
1
2
3
2
X
X
4
X
X
6
X
X
X
8
X
X
X
JS43 Base blade planar (P1) DIMM slots
DIMM
count
1
2
3
2
X
X
4
X
X
6
X
X
8
X
X
10
X
X
X
12
X
X
X
14
X
X
X
16
X
X
X
36
JS23/JS43 Type 7778: Installation and User's Guide
and 11, 14 and 16, 10 and 12, 13 and 15 for the JS43).
can mix compatible DIMMs from different manufacturers.
the same size and speed.
http://www.ibm.com/servers/eserver/serverproven/compat/us/.
After you install or remove a DIMM, the blade server is automatically
reconfigured, and the new configuration information is stored.
4
5
6
7
X
X
X
X
X
X
X
4
5
6
7
X
X
X
X
X
X
X
X
X
X
X
X
X
X
8
X
X
X
JS43 Expansion unit planar (P2) DIMM slots
8
9
10
11
X
X
X
X
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
16
X
X
X
X
X
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