Lockstep mode, Dual processors configuration – Acer AT150 F1 User Manual

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3 System upgrades

Dual processors 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 and 4 GB DIMMs.
4. DIMM modules support 8 GB DIMMs (support depends
on availability).
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 same

address is used on both channels such that an address error on any

channel is detectable by ECC. Lockstep Channel mode is the only

RAS mode that supports x8 SDDC.

•

Channel 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.

CPU 1

CPU 2

Configuration