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Dell PowerEdge FC430 Owner's Manual

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Advanced Error Correction Code (lockstep)

Advanced Error Correction Code (ECC) mode extends SDDC from x4 DRAM based DIMMs to both x4 and x8 DRAMs. This protects against single DRAM chip failures during normal operation.

The installation guidelines for memory modules are as follows:
  • Memory modules must be identical in size, speed, and technology.
  • DIMMs installed in memory sockets with white release levers must be identical and the same rule applies for sockets with black release levers. This ensures that identical DIMMs are installed in matched pair —for example, A1 with A2, A3 with A4, A5 with A6, and so on.
  • DIMMs installed in memory sockets with white release tabs must be identical and similar rule applies for sockets with black release tabs. This ensures that identical DIMMs are installed in matched pairs- for example, A1 with A2, A3 with A4 and so on.
Table 1. Advanced ECC (Lockstep)Advanced ECC (Lockstep).
Processor Configuration Memory population rules Memory population information
Single CPU Advanced ECC (Lockstep) {1,2}, {3,4} Numbers inside the brackets indicate the slots that must be populated in pairs, odd amount of pairs allowed.
Dual CPU
NOTE: Populate round robin starting with CPU1
 Advanced ECC (Lockstep) C1{1,2},C2{1,2},C1{3,4},C2{3,4}…. Numbers inside the brackets indicate the slots that must be populated in pairs, odd amount of pairs allowed.
NOTE: Advanced ECC with mirroring is not supported.
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