troubleshooting Question

Completely confused by memory options for dual LGA 2011 Xeon system

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AgeOfEmpiresFlag for United States of America asked on
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I've built (another) home server that is LGA 2011 based.  My motherboard is a Supermicro X9DRL-3F, dual processor board.  I've currently got one Xeon processor, E5-2620, and a 8x2x2 memory configuration.

I am getting ready to add the 2nd processor and another 32GB of memory.  However, Crucial (current memory) has many more options for memory than when I first built the machine.  So many so, that I am now wondering if my current memory is one of the sub-optimal choices.

Instead of trying to exactly match the next 32GB with what I have now, my question centers around going forward, even if I have to replace the current 32GB.  I intend to have 64GB of ECC registered memory.  Problem is, among the memory options, there is single/dual/quad ranks, x4 vs. x8 based, voltage options, etc.

I honestly don't understand the x4/x8 thing and can't admit that I totally understand the ranking.  However, I've read multiple "sources" that seem to imply to me that different platforms are more efficient with certain types of memory (ex: quad ranked is preferable in some situations, dual in others, etc).

Can anyone shed any light on the more preferred configuration for my system?  There are at least 12 different options just a Crucial that fit my system in a 8x2 configuration.  When spending this sort of $'s for home, I just don't want to buy $600+ worth of memory that is a suboptimal configuration if the same amount will buy a better config.

Not sure if I've given enough detail or not, but I'm just not a memory expert.

Thanks in advance.
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