Dell PowerEdgeFC430 Owner's Manual page 57

Table 25. Advanced ECC (Lockstep)
Processor
Single CPU
Dual CPU
(Lockstep)
Popu ate
NOTE:
round robin
starting with
CPU1
NOTE: Advanced ECC with mirroring is not supported.
Memory optimized (independent channel) mode
This mode supports Single Device Data Correction (SDDC) only for memorymodules that use x4 device width. It does not imposeany
specific slot populationrequirements.
Table 26. Memory optimized (independent channel) mode
Processor
Single CPU
NOTE:Optimizedmodep ermits
unbalanced configuration s, eg, 1:1:1:0
DIMM perchannel(DPC
Dual CPU
NOTE: Populateroundrobinstartingwith
CPU1:
NOTE: Optimized mode permits
unbalanced configurations, eg, 2:1:1:1 DPC
combinations.
Memory mirroring
Memory mirroring offers thestrongest memory module reliability mode compared to all other modes, providing improved uncorrectable
multi-bit failure protection. Inamirrored configuration, the total available system memoryis one half of the total installed physicalmemory.
Half of the installed memory is used to mirror the active memory modules. In the event of an uncorrectable error, the system switches
over to the mirrored copy. This ensures SDDC and multi-bit protection.
The installation guidelines for memory modules are as follows:
• Memory modules must be identical in size, speed, and technology.
• DIMMsinstalledinmemorysockets with whitereleasetabsmust beidenticalandsimilarrule appliesforsockets with blackrelease
tabs.This ensures that identical DIMMs are installed in matched pairs—for example, A1 with A2, A3 with A4.
NOTE: Mirroring and Advanced ECC modes require minimum of two DIMMs per CPU and must be populated in pairs of either
twoor four DIMMs per CPU.
Configuration Memory population rules
Advanced ECC {1,2}, {3,4}
(Lockstep)
Advanced ECC C1{1,2},C2{1,2},C1{3,4},C2{3,4}....
Configuration
Optimized (independent 1, 2, 3, 4
channel)
combinations.
Optimized (independent
channel)
Memory population information
Numbers inside the brackets indicate
the slots that must be populated in
pairs, odd amount of pairs allowed.
Numbers inside the brackets indicate
the slots that must be populated in
pairs, odd amount of pairs allowed.
Memory population rules
C1{1}, C2{1}, C1{2}, C2{2},
C1{3}, C2{3}...
Installing and removing sled components
Memory population
information
Populate in this order,
odd amount of DIMMs
per CPU allowed.
Populate in this order,
odd amount of DIMMs
per CPU allowed.
57