Kontron TIGH2U Carrier Grade Server - Manual (Page 40)

TIGH2U Server—Server Component Installations and Upgrades
Kontron Carrier Grade Server TIGH2U
Product Guide, rev.1.2 December 2009
40
3.4.2.3 DIMM Population Rules and Supported DIMM Configurations
DIMM population rules depend on the operating mode of the memory controller, which is determined
by the number of DIMMs installed. DIMMs must be populated in pairs. DIMM pairs are populated in
the following DIMM socket order:
1. A1 and B1
2. C1 and D1
3. A2 and B2
4. C2 and D2
DIMMs within a given pair must be identical with respect to size, speed, and organization. However,
DIMM capacities can be different between different DIMM pairs.
For example, a valid mixed-DIMM configuration may have:
• 512 Mbyte FBDIMMs installed in DIMM sockets A1 and B1
• 1 Gbyte FBDIMMs installed in DIMM sockets C1 and D1
The supported DIMM configurations for the T5000PAL server board are in Table 10 .
Table 10. Supported DIMM Configurations
Branch 0 Branch 1
Mirroring
Possible
Sparing
Possible
Channel A Channel B Channel C Channel D
DIMM A1 DIMM A2 DIMM B1 DIMM B2 DIMM C1 DIMM C2 DIMM D1 DIMM D2
Y (0)
Y
Y (0)
Y Y (0, 1)
 = Supported and validated configuration; socket is
populated.
 = Supported, not validated configuration; socket is
populated.
 = Socket is not populated.
Mirroring: Y = Yes. Indicates that configuration
supports memory mirroring.
Sparing: Y(x) = Yes. Indicates that configuration
supports memory sparing, where x is one of the
following:
• 0: Sparing supported on Branch 0 only
• 1: Sparing supported on Branch 1 only
• 0,1: Sparing supported on both branches
The following restrictions apply:
• Single channel mode is only tested and supported with a 512 Mbyte x8 FBDIMM installed in DIMM
socket A1.
• The supported memory configurations must meet the population rules defined above.
• For best performance, the number of DIMMs installed should be balanced across both memory
branches. For example: a four-DIMM configuration performs better than a two-DIMM
configuration and should be installed in DIMM sockets A1, B1, C1, and D1. An eight-DIMM
configuration performs better than a six-DIMM configuration.
• Although mixed DIMM capacities between channels is supported, Kontron does not validate
DIMMs in mixed-DIMM configurations.