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tictoc
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tictoc's post in HP Z840 36C/72T Workstation Build was marked as the answer
Octal rank is different than octal channel. Octal rank refers to the number of ranks per dimm. LRDIMMs generally come in quad rank and octal rank, which allows increased capacity per dimm. The increased capacity of LRDIMMs trades maximum capacity for performance.
In regards to whether or not it's octa channel, the platform itself (2 quad channel CPUs) technically has 8 channels, but each CPU can only address 4 channels locally. While the QPI is a fast path (8GT/s on Xeon v3) it's no where near as fast as local memory access. Generally speaking taking the performance hit is worth it due to the doubling of addressable memory.
Just saw your reply and that is all correct. 🙂
Specifically for your system the setup is good. The memory you have is single rank, so if you wanted to increase performance, you could look at getting some dual rank dimms which would bump up the memory throughput. For maximum performance anything above dual rank will generally be slower, and is only worth it if you actually need the additional capacity.