I tested all bios settings such as Command Rate, Static Read Control, Performance Level(aka tRD), all DIMM slots, AI Clock twister, and finally dual channel(using 2 sticks of course ). Under SuperPi 1M, PiFast, MaxxMem, WPrime, and PCMark.
Results were all of those settings only have an improvement under MaxxMem and PCMark.
That's why I use only single channel, as dual channel was useless to improve the score
EDIT: And you why do you use dual channel btw ?
Maybe with ddr3 there is an improvement.