Finding the right pair of ram kit (AMD CPU)

hello, i dont know where to start but im looking into upgrading my set of rams.
curently running on amd 1090t clocked to 4ghz and mobo asus crosshair IV formula.

i set my eyes on gskill rams... they look awesome and some nice reviews but i cant seem to find a suitable ram for theis system build as there is too many choices.

please help and suggest me ram kits to get.

Thanks in advance.

You can check my test of 2 G.Skill F3-12800CL9D-8GBXL kits on 990FX. Should be the same on your board. Good enough RAM if you don't need max performance at all cost.
http://www.overclockers.com/forums/showthread.php?p=7009689

those kits are design for intel they said ?
or its universal thing?

Designed for Intel but most G.Skill kits will have that label now. As long as XMP profiles are working or you know how to set all manually it will be fine. I had no problems with AMD boards.
You can find other kits on G.Skill site but most were tested on Intel boards.