All 3 modes support ECC.  Optimizer mode allows you to use all the slots and memory capacity. Regards,  
Hi All, I read hardware Owner Manual for Dell server about System Memory. There are 3 modes to install memory module in DELL server: + Advanced ECC (Lockstep) Mode: Uses 2 channel closet to cpu and support SDDC for both x4 and x8 memory module + Mirror mode + Optimizer (Independent Channel) Mode Does Optimizer Mode support bit error correction (single bit and multi bits) or SDDC x4 or SDDC x8? Anyone can help me this issuse? Many Thanks, nampnx
Ram installation Modes