User`s guide

User Guide
31
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Install a minimum of two DIMMs on the same channel on any branch, and enable
the memory sparing feature in the BIOS Setup.
Example: DIMM_A1 and DIMM_A2.
DIMM Population Rules
DIMM population rules depend on the operating mode of the memory controller. Refer
to the rules mentioned above for more information.
On the server board DIMMs must be populated in the following order: bank A1 and
B1, bank A2 and B2, etc.
DIMMs must be installed starting with the lowest number slot in a given channel.
DIMMs must meet the following requirements:
- Use only Fully Buffered DIMMs (FBD) with DDR2 DRAM technology.
- Use only FBD DDR2-533 and FBD DDR2-667 stacked DIMM modules. The
peak data bandwidth in dual channel mode is 6.4 GB/s (2 x 3.2 GB/s) with
DDR2-533/PC2-4200 and 8.0 GB/s with DDR2-667/PC2-5300.
We recommend you do not mix DIMMs of different speed ratings, even though it is
supported. The overall system memory speed will be determined by the slowest DIMM
populated.