My ram isn't working with dual channel and they both work fine?

[sebastianrangel2001]

I need help 2×4gb ddr4 ram with z170 MB

 

[Hoetan]

Make sure you have the two sticks of RAM in the correct DIMM slots.

Most motherboards come with 4 DIMM slots. (Pictured below)

Normally in dual channel configurations, the RAM is seated in DIMM slots 1 and 3 (the dark gray DIMM slots in the picture above).

Refer to your motherboard manual for correct RAM seating.

Hope this helped!
-Lachlan