Simpler Navigation coming for Servers and Operating Systems
Coming soon: a much simpler Servers and Operating Systems section of the Community. We will combine many of the older boards, and you won't have to click through so many levels to get at the information you need. If you are looking for an older board and do not find it, check the consolidated boards, as the posts are still there.
HPE BladeSystem Server Blades
cancel
Showing results for 
Search instead for 
Did you mean: 

Dual rank vs. Single rank memory question

chuckk281
Trusted Contributor

Dual rank vs. Single rank memory question

Vasyl had some questions regarding memory useage:

 

**************

 

What will be the best choice in terms of performance, 8Gb single rank or dual rank kit for E5-2600? All other parameters are identical.  One DpC, two DpC.

 

*************

 

Serge had some answers:

 

****************

 

We are basically in a transition period as 2Gbit DRAM approach end of life in the next 1-2 years and 4Gbit DRAM have become mainstream.

 

  1. In a one DIMM-per-channel configuration, dual-rank will perform better than single-rank.  In most cases, only memory-intensive applications will notice the difference (like HPC).
  2. In a two DIMM-per-channel configuration, the performance of single and dual-rank will be almost identical (within the accuracy of the measurement).
  3. The single-rank DIMM will be lower power than the dual-rank DIMM.
  4. Long-term, the single-rank DIMM will end up being lower cost and having better availability than the dual-rank DIMM.

 

The main reason we still have the dual-rank DIMM is #1, but I would not recommend it unless the customer’s application requires only one DIMM per channel and is memory intensive.

 

 ****************

 

Other input to this question?