Sparing mode, Memory Identification, Density, Rank

Acer AR380 F1 specifications

address is used on both channels such that an address error on any channel is detectable by bad ECC. Lockstep Channel mode is the only RAS mode that supports x8 SDDC.

•Channel 3 is no function and can’t be populated in this mode.

•Follow the population rules described in independent mode.

•Lockstep mode needs the channel 1 & channel 2 with identical DIMM. DIMM slot populations within a channel do not have to be identical but the same DIMM slot location across channel 1 and channel 2 must be the same. DIMM1A and DIMM2A should be the same type, size and manufacturer. DIMM1B and DIMM2B memory should be the same type, size and manufacturer. DIMM1C and DIMM2C memory should be the same type, size and manufacturer.

•Same rule is applied to the CPU2.

•3 DIMM per channel configuration is only available for single/dual rank RDIMM.

•Please refer to the User Guide for complete population for both single and dual processor configurations.

Sparing mode:

•In this mode, if system detects degrading memory and system still not crash, the data in failed channel will be copied to spare channel. Failed channel is then isolated and spare channel becomes active. But if any uncorrectable error happens before the isolation, it will still cause the system stop normal operation.

•Channel 3 is the spare channel. Therefore, the effective size will be reduced by one-third.

•Follow the population rules described in independent mode.

•Sparing mode need all three channels with identical DIMMs. 1A, 2A and 3A should be the same type, size and manufacturer. 1B, 2B and 3B memory should be the same type, size and manufacturer. 1C, 2C and 3C memory should be the same type, size and manufacturer. Same rule is applied to CPU2.

•Memory sparing mode is only supported by Intel Xeon 5600 series processor. Intel Xeon 5500 series processor does NOT support the memory sparing mode.

•3 DIMM per channel configuration is only available for single/dual rank RDIMM.

•Please refer to the User Guide for complete population for both single and dual processor configurations.

Memory Identification

Generally, there are some memory information printed on the label of DIMM, but different vendor may have different format. For example:

4GB 2Rx4 PC3-10600R xx xx xxx

1.Density

1GB, 2GB, 4GB, 8GB, 16GB

2.Rank

1R = Single Rank

2R = Dual Rank

4R = Quad Rank

Note: if any quad rank DIMM is used, maximum only 2 DIMM per channel can be supported

AR380 F1 specifications

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