Acer AW2000h-AW175h F1, Service Manual

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48 Chapter 7
Notes: 1. Place DIMMs in “X” location.
2. DIMM population must correspond to the above tables.
3. DIMM modules support 1 GB, 2 GB, 4 GB and 8 GB DIMMS.
4. The size of each DIMM must be the same across the configuration.
5. Do not mix UDIMMs with RDIMMs.
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.
•
Channels 3 has no function and cannot be populated in this mode.
•
Follow the population rules described in independent mode.
•
DIMM modules installed in channels 1 and 2 must be identical — 1A and 2A should be the same
type, size and manufacturer. 1B and 2B memory should be the same type, size and manufacturer.
However, it is not necessary for slot A to have the same memory module as slot B within a
channel.
•
The same rule applies to processor 2.
Memory population for mirroring mode
Single processor configuration
Dual processor configuration
Notes: 1. Place DIMMs in “X” location.
2. DIMM population must correspond to the above tables.
3. DIMM modules support 1 GB, 2 GB, 4 GB and 8 GB DIMMS.
4. The size of each DIMM must be the same across the configuration.
5. Do not mix UDIMMs with RDIMMs.
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
Channel 1 Channel 2 Channel 3 Channel 1 Channel 2 Channel 3
Configuration 1B 1A 2B 2A 3B 3A 1B 1A 2B 2A 3B 3A
A X X
B X X X
C X X X X
D X X X X X X
E X X X X X X X X
F X X X X X X X X X
G X X X X X X X X X X X X
Single processor
Processor 1 P1DIMM slots
Channel 1 Channel 2 Channel 3
Configuration 1B 1A 2B 2A 3B 3A
A X X NA NA
B X X X X NA NA
Dual processors
Processor 1 P1DIMM slots Processor 2 P2DIMM slots
Channel 1 Channel 2 Channel 3 Channel 1 Channel 2 Channel 3
Configuration 1B 1A 2B 2A 3B 3A 1B 1A 2B 2A 3B 3A
A X X NA NA NA NA
B X X NA NA X X NA NA
C X X X X NA NA X X NA NA
D X X X X NA NA X X X X NA NA
Dual processors