NEC N8100-2089F User Manual page 75

Chapter 2 Preparations
(2) Memory Lock Step Feature (x8 SDDC)
In Memory Lock Step feature, the DIMMs in two groups corresponding to two memory channels (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.
 Memory Lock Step feature uses channels 2 and 3. In Memory Lock Step configuration,
Note
the memory channel 1 of each CPU (CPU1-DIMM1/4, CPU2-DIMM1/4) is disabled.
 To use Memory LockStep feature (x8 SDDC), install N8102-560/561/562 additional
memory board (two DIMMs of same model).
 Any other memory board than N8102-560/561/562 cannot be installed together.
 To use Memory LockStep feature in 2-CPU configuration, install two sets of
N8102-560/561/562 additional memory board (four DIMMs of same model).
 DIMMs to be installed in Lockstep set must have same capacity.
Memory controller
Memory controller
Express5800/T120e User's Guide
1. Installing Internal Optional Devices
LockStep set
#3
LockStep set
#1
LockStep set
#4
LockStep set
#2
75