In general dual (or even quad) rank memories offer higher performance in server application:
http://globalsp.ts.fujitsu.com/dmsp/Publications/public/wp-sandy-bridge-ep-memory-performance-ww-en.pdf
http://hpc.fs.uni-lj.si/sites/default/files/Memory%20Intel%20Xeon5500.pdf
It's much harder to find any information of memory performance in desktop system. Internet boards present various opinion on single vs dual rank subject, but not supported by any test results. Only info I've found comes from computerbase.de:
http://www.computerbase.de/2014-01/amd-kaveri-arbeitsspeicher/2/
In short: rank number did not make any difference in CPU performance on both Haswell and Kaveri platforms while was significant in GPU tests, especially for AMD where pair of dual rank memories offered 7% better performance than pair of single rank memories on A10-7850K system.
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