i can't see anything about what cas latency is being used. i see the ram is 9/11/11 at 2133. i've found 8/9/8 settings at ddr3-1600 to work pretty well on haswell, giving some bump over 9/9/9 or 9/10/9. still being faster than ivy bridge cpu with ddr3-2000 9/11/9. some applications benefit a lot more from faster ram than others though. i wonder if more tests are needed of normal cpu type things.
the timed apache compile i suppose is one thing that was significant. i saw some boost with compile times on i7 with tighter timings iirc.