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Chapter 2 Preparations
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Memory LockStep feature (x8 SDDC)
With the Memory LockStep feature, the DIMMs in two groups corresponding to two memory channels (channels
0 and 1, or channels 2 and 3) is multiplexed and operated in parallel to enable x8 SDDC. With this feature, a
single device can detect and correct one to eight-bit error.
LockStep set
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LockStep set
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LockStep set
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LockStep set
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The Memory LockStep feature can be used under the following conditions:
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Install DIMMs in DIMM socket to configure a LockStep set.
•
All the installed DIMMs must be the same capacity.
•
See Chapter 2 (1. System BIOS) in "Maintenance Guide" to change parameters as shown below.
Advanced → Memory Configuration → Memory RAS Mode → Change to LockStep.
•
After restarting, 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.
Note
• Memory LockStep feature uses channels 0 and 1 or channels 2 and 3.
• To use Memory LockStep feature, install N8102-691/692 additional memory card
(two DIMMs of same model).
• DIMMs used in LockStep set must be of the same model number.
• Any memory card other than N8102-691/692 additional memory card cannot be
installed together.
Memory controller
Memory controller
Express5800/R120g-2E User's Guide
1. Installing Internal Optional Devices
LockStep set
LockStep set
LockStep set
LockStep set
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