Stuck on cpu+dram led unless I use a single

Ok to use 3 RAM sticks in this board? ram slot 1 and 3 it's called dual channel configuration, all modern motherboards are designed so that the ram in the adjacent slot use the same “ rambo slot 3 That board supports 4 DIMMS The manual also states a confusing; “Support for 1 Gb, 2 Gb, and 4 Gb memory technology

rambo 789 slot This slot information means that your device supports 2 slots to install RAM and you are using only 1 of them, it supports 1 more slot to