1. Installing Internal Optional Devices
Express5800/T120d User’s Guide
73
Chapter 2 Preparations
Memory Lock Step feature can be used under the following conditions:
Install two DIMMs that operate in parallel in memory socket.
All the installed DIMMs should have the same model number.
Refer
to
Chapter 2 (1. System BIOS Setup)
in
“Maintenance Guide”
, change parameters as shown below,
save the settings and exit from SETUP.
[Advanced] – [Memory Configuration] – [Memory RAS Mode] : Change to [Lock Step]
After restart, run SETUP again, and check if "
Lock Step
" is displayed for the following parameter.
Advanced
Memory Configuration
Memory Information
CPUx_DIMMx Status
Installation order depends on CPU configuration. See the figure below.
Memory Lock Step cannot be configured in the following cases:
Memory Lock Step between memory channels of different memory controllers (CPU)
Memory Lock Step within the same memory channel
Notes on Configuring Lock Step
When you additionally install or remove DIMMs that unable to configure Memory LockStep configuration,
Memory RAS Mode is changed to "Independent".
"LockStep" is removed from
Advanced
Memory Configuration
Memory Information
CPUx_DIMMx
Status xxxx MB (LockStep)
in BIOS SETUP.
REAR
FRONT
1-CPU
configuration
(Empty)
(Empty)
1st set
2nd set
1st set
2nd set
2-CPU
configuration
(Empty)
(Empty)
1st set
3rd set
1st set
3rd set
4th set
2nd set
4th set
2nd set
(Empty)
(Empty)
