Acer AR380 F1 User Manual
Page 72
3 System upgrades
54
Mirroring mode:
•
For mirroring mode, the memory contains a primary image and a
copy of the primary image. Therefore, the effective size of
memory is reduced by at least one-half.
•
Channel 3 has no function and can't be populated in this mode.
•
Follow the population rules described in independent mode.
•
Mirroring 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.
•
16GB DIMM is only supported for Intel Xeon 5600 series processor.
•
Please refer to the User Guide for complete population for both
single and dual processor configurations.
Lockstep mode:
•
In Lockstep Channel Mode, each memory access is a 128-bit data
access that spans Channel 1 and Channel 2. This is done to support
SDDC for DRAM devices with 8-bit wide data ports. The same
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 has 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.