To not much surprise given our past AMD APU memory tests and other Phoronix articles, the memory frequency does mean a big difference in overall system performance. Even in going from DDR3-1600MHz to DDR3-2133MHz yielded a 24% boost in frame-rate.
The OpenArena performance was also up by almost 24% in going from DDR3-1600MHz to DDR3-2133MHz, or a 33% boost in memory frequency. Between DDR3-800MHz and DDR3-2133MHz the frame-rate was up by 2.37x.
It will be interesting to see how DDR3-2400MHz memory performs for AMD's high-end A10-7850K Kaveri APU.
The extra dollars for higher frequency memory is certainly worth it for Kaveri as with earlier generations of AMD APUs.