Actually your system is prompting you to change memory configuration to increase performance. The motherboard supports ram in dual channel mode that theoretically doubles the performance of DDR ram. What i can figure out from the picture is that you have 4 RAM modules and they are not of same model. What you can try is that open your system and find out the RAM modules. There will be two pairs of memory slots lets call them A and B. Pair A will have slots A0 and A1 and similarly B will have B0 and B1. please note that i am assuming this at my own, you will not find any mark like A0 etc on or near the slots. You can pretty much assume any pair as A and other as B.
Now what you need to do is to choose any pair and replace its modules with one another, i mean for example if you choose pair A then place module currently in A0 into A1 and that of A1 into A0. I hope you got my point.
See if it helps.
