I have just built a new pc using: G.Skill F4-4000C18D-16GTZR. When building I read that RAM is normaly placed so there is a empty slots between the 2 modules however when I tried this only 1 of the RAM modules worked. I have now placed them so there is no space and they are next to eachother in slot 1 & 2 and it seems to be working. Apologies for the probably incorrect terminology but is this right or is there something wrong with either RAM or mobo. Thanks.