1. Installing Internal Optional Devices
Express5800/R120d-2M User’s Guide
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Chapter 2 Preparations
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Memory Lock Step Feature (x8 SDDC)
In Memory Lock Step 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 (x8 Single Device Data
Correction). With this feature, a single device can detect and correct one to eight-bit error.
Note
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Memory LockStep feature uses channels 0 and 1 or channels 2 and 3.
•
To use Memory LockStep feature, install N8102-472/473/474/475 additional memory
board (two DIMMs of same model).
•
DIMMs to be installed in Lockstep set must have same capacity.
LockStep Set
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LockStep Set
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LockStep Set
#1
LockStep Set
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LockStep Set
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LockStep Set
#2
LockStep Set
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LockStep Set
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LockStep Set
#3
LockStep Set
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LockStep Set
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LockStep Set
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Memory controller
Memory controller
