IBM x3250 M3 Problem Determination And Service Manual page 173

v You can install a maximum of 32 GB of memory in the server when you use
RDIMMs.
v The following table lists the supported RDIMM population.
Table 12. Supported RDIMM population per channel
DIMM
connectors per DIMMs installed
channel in each channel DIMM type
3 1
3 2
3 3
3 1
3 2
v The following table lists the maximum DIMM population using ranked RDIMMs.
Table 13. Maximum memory population using ranked RDIMMs (depending on your model)
Number of RDIMMs DIMM type
6 Single-rank RDIMMs
6 Dual-rank RDIMMs
4 Dual-rank RDIMMs
4 Quad-rank RDIMMs
6 Dual-rank RDIMMs
4 Quad-rank RDIMMs
v The following table shows the RDIMM memory population rule to optimize the
system performance.
Table 14. RDIMM population rule for dual-channel symmetric mode
DIMM DIMM
connector 1 connector 2
Populated Empty
Populated Empty
Populated Populated
Populated Populated
The following illustration shows the location of the DIMMs connectors on the system
board.
DIMM speed
Registered 1066, 1333
DDR3 ECC
Registered 1066, 1333
DDR3 ECC
Registered 800
DDR3 ECC
Registered 1066
DDR3 ECC
Registered 800
DDR3 ECC
Size
1 GB
2 GB
4 GB
4 GB
4 GB
8 GB
DIMM DIMM
connector 3 connector 4
Empty Empty
Empty Populated
Empty Populated
Populated Populated
Chapter 5. Removing and replacing server components
Ranks per
DIMM (any
combination)
Single-rank,
dual-rank
Single-rank,
dual-rank
Single-rank,
dual-rank
Quad-rank
Quad-rank
Total memory
6 GB
12 GB
16 GB
16 GB
24 GB
32 GB
DIMM DIMM
connector 5 connector 6
Empty Empty
Empty Empty
Populated Empty
Populated Populated
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