Oracle X7-8 Service Manual page 187

Always populate the DIMM slot furthest from the memory buffer first.
Note -
1. Installation Order DIMM: 1 D7 2 D4, 3 D9, 4 D2 5 D11 6 D0, 7 D6, 8 D5, 9 D8, 10 D3, 11
D10, 12 D1
2. Populate the slots with black slots and black levers: D0, D3, D6, D9, D12, D15, D18, D21
The slot population for the minimum DIMM configuration is D0/D6/D12/D18 per CMOD
3. Populate the white slot, white lever slots: D2, D5, D8, D11, D14, D17, D20, D23
For component serviceability, locations, and designations, see
Components" on page 24.
DIMM Rules
The DIMM installation rule aims to maximize the memory bandwidth available by spreading
the memory across all six memory channels.
When installing DIMMs, consider the following rules:
When two DIMMs are in a channel the channel speed will default to the maximum
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supported speed (listed in the DIMM's SPD and read by BIOS) of the slowest DIMM in the
channel. For example: if an 1866 MT/s-compliant DIMM is installed in a channel with a
2133 MT/s -compliant DIMM, the channel speed will be limited to 1866 MT/s.
A maximum of 8 logical ranks (ranks seen by the host) per channel is allowed.
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When one DIMM is used, it must be populated in DIMM slot 0 (farthest away from the
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CPU) of a given channel.
When single or dual rank RDIMMs are populated for 2DPC (two DIMMs per channel),
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always populate the higher quantity rank DIMM first (starting from the farthest slot). For a
2SPC (two slots per channel) example, first populate a dual rank DIMM in the DIMM0 slot.
Then a single rank DIMM may be populated in the DIMM1 slot.
All CMODs should be populated identically.
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Memory quantity needs to be equal across all CMODs.
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All DIMMs in a system should be the same type and size.
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The minimum DIMM configuration as shipped from the factory is four 16 GB DIMMs in
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each CMOD, installed is slots D0, D6, D12 and D18.
An upgrade of four DIMMs for each CMOD is allowed in this configuration by installing
four DIMMs in slots D3, D9, D15 and D21.
Aside from an upgrade to the minimum shipped configuration (stated above), DIMMs must
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be added to each CMOD in sets of eight (one for each memory buffer channel). Add eight
DIMMs to each CMOD starting with CMOD 0 and ending with CMOD 3 (four-CMOD
Install a Processor
"Identifying
Servicing Components 187