quad channel memory
https://www.newegg.com/Product/Product.aspx?Item=N82E16820232492
dual channel memory (current winner)
https://www.newegg.com/Product/Product.aspx?Item=N82E16820231907
Results for 8 sticks of dual channel memory, 4GB each at 3022 MHZ.
Streams Runs H/run Cur H/s Cur TiC% Cur WL% Argon % Sha % Shares Finds Reject
16 34 9 29.34 92.10 0.000 99.995 0.001 10 0 0
16 35 9 29.53 91.82 0.000 99.995 0.001 10 0 0
16 35 9 29.30 92.57 0.000 99.995 0.001 10 0 0
16 36 9 29.27 91.22 0.000 99.995 0.001 10 0 0
16 35 9 29.53 90.89 0.000 99.995 0.001 10 0 0
16 35 9 29.70 92.57 0.000 99.995 0.001 10 0 0
Also I am running GPUs mining another coin on this rig, so if you remove this from your setup, you might be able to run the memory at the higher speed for the extra 1/2 H/S. Balancing GPU, CPU and system memory is an art!
I experienced similar instances when I mined Verium. I will review what changes I made to optimize the hash related to RAM.