Which is smarter? Dual rank or dual channel?

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steadypaws

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May 16, 2015
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Here's a question I haven't been able to find anything real on so far. We know that dual channel is better than a single DIMM (single rank, at least). We also know that dual rank is better than single rank, at least in a single DIMM configuration. (I also read on HP that dual rank DIMMs don't really provide any benefit over single rank when in a dual channel configuration.)

My question is this (example): Would a 2x4GB single rank, dual channel configuration be better (faster/stabler/etc.) than a single 8GB dual rank DIMM?

I'm not certain how dual rank compares with dual channel, performance wise. Does anyone know of a comparison table anywhere?
 
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brispuss

Splendid
Dec 27, 2014
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Not aware of specific performance tests or tables comparing dual rank/single channel to single rank/dual channel.

Generally, from some tests of dual rank versus single rank, dual rank architecture might provide up to around 0.5% improvement in memory bandwidth over single rank architecture. But dual channel configuration will provide up to double the memory bandwidth (100% gain) over single channel configuration.

So, theoretically, the dual channel configuration with far greater memory bandwidth should provide the better performance over dual rank architecture, particularly if programs maximize the use of system memory bandwidth.
 
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