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Supported DIMMs
The BladeCenter JS12 Type 7998 blade server contains eight memory connectors for
industry-standard registered, dual-inline-memory modules (RDIMMs). The DIMMS
are very low profile, which means that each DIMM has a height of 18.3 millimeters
(mm). Total memory can range from a minimum of 2 gigabytes (GB) to a
maximum of 64 GB.
See Chapter 3, "Parts listing, Type 7998," on page 235 for memory modules that
you can order from IBM.
Memory module rules:
v Install DIMMs in pairs in the following connectors to have a supported (tested)
v Both DIMMs in a pair must be the same size, speed, type, technology, and
v When using 4 DIMMs in DIMM 1 and DIMM 3 (pair 1) and DIMM 6 and
v When using 8 GB DIMMs, all of the DIMMS used must be 8 GB.
v Install only supported DIMMs, as described on the ServerProven
v Installing or removing DIMMs changes the configuration of the blade server.
4
JS12 Type 7998: Problem Determination and Service Guide
configuration:
Table 1. Supported use of DIMMs
DIMM
Connectors
Two
Pair 1 (DIMM 1
Yes
and DIMM 3)
Pair 2 (DIMM 6
No
and DIMM 8)
Pair 3 (DIMM 2
No
and DIMM 4)
Pair 4 (DIMM 5
No
and DIMM 7)
See "System-board connectors" on page 9 for DIMM connector locations.
physical design. You can mix compatible DIMMs from different manufacturers.
Each DIMM in each of the following sets of four connectors must be the same
size:
Size 1 DIMM 1 and DIMM 3 (pair 1) and DIMM 2 and DIMM 4 (pair 3) when
using 6 or 8 DIMMs
Size 2 DIMM 5 and DIMM 7 (pair 4) and DIMM 6 and DIMM 8 (pair 2) when
using 8 DIMMs
DIMM 8 (pair 2), DIMMs in the second pair can differ in size and speed from
the first pair.
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.
Number of DIMMs in Use
Four
Six
Yes
Yes
Yes
Yes
No
Yes
No
No
Eight
Yes
Yes
Yes
Yes
®
Web site. See
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