CPU: Inter(R) Core(TM) i5-4690k

Board: Asrock z97 Anniversary Edition

RAM: HyperX Fury DDR3 1866mhz 4gb x 2 (not a kit) (HX318C10F/4)

GPU: GeForce GTX 750 Ti

OS: Win 7 Professional

So here's the story, when i bought my PC (2 months ago), my budget was very limited. So, i opted to go with a single DDR3 memory module (HyperX Fury 4gb 1866mhz) and planned to buy another later down the road. That happened yesterday, bought 1 exactly like it (even the color "Blue"). But, i wasn't able to place them on both blue slots nor both black. (A1-B1 and A2-B2), neither of them let me boot to bios. However, I am able to boot to bios when i placed the dimms on B1-B2 but not A1-A2. As i see on the bios, it detects that my memory installed is 8gb but on a single channel. Tested both dimms and they are working fine. I am able to boot to bios while using just one dimm. Although, i haven't tested all the dimm slots.

My questions are, i should be able to use them for dual channel, am i right? Or maybe i bought the wrong kind of memory for my board? Does buying a "Kit" matters when wanting to have a dual channel or what i bought is "just right" and there may be something wrong with my board?

Thanks