Oracle Sun Netra T5440 Service Manual page 91

DIMM filler cards are required in all empty slots in the memory mezzanine tray.
Caution -
DIMM filler cards are not required on the motherboard.
32 slots hold industry-standard FB-DIMM memory modules. 16 slots are located on the
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motherboard, and an additional 16 slots are available through a memory expansion upgrade
(memory mezzanine).
All FB-DIMMs must be the same density (same type).
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Only single- and dual-rank fully buffered (FB) DIMMs, per JEDEC standard JESD206,
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are supported.
FBDIMMs using x4 and x8 DRAMs are supported. However, chipkill is supported only
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on x4-based FBDIMMs.All FBDIMMs within the system must be of the same total
capacity.
All FBDIMMs within the system must be of the same number of ranks.
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All FBDIMMs within the system must use the same width (x4 or x8) DRAMs.
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Mixing of FBDIMMs from different vendors is allowed.
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Mixing of FBDIMMs with AMBs from different vendors is allowed.
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There must b a minimum 8 FBDIMMs installed in the system.
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At minimum, Channel 0, FB-DIMM Slot 0 in all branches must be populated with FB-
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DIMMS of the same density (same type).
In branches populated with more than one FB-DIMM (for example, in 8 and 16 FB-DIMM
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configurations), FB-DIMMs are addressed in pairs. Each pair must be identical (same part
number).
A replacement FB-DIMM must have the same part number as the other FB-DIMM in its
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pair. For example, a replacement FB-DIMM in J1201 must have the same part number as
the FB-DIMM in J1401, in order to ensure an identical pair.
If you are unable to obtain a matching FB-DIMM, you must replace both FB‐ DIMMs in the
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pair.
All Sun Netra T5440 servers support the following configurations, as shown in
8 FB-DIMMs (Group 1)
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12 FB-DIMMs (Groups 1 and 2)
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16 FB-DIMMs (Groups 1, 2, and 3) (fully populated motherboard)
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4.7 FB-DIMM Configuration Reference
Chapter 4 • Replacing Motherboard Assembly Components
Figure 4-13:
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