if you use them together then I think you may have issue's , might not be a good idea .
It is recommended that when you use ram sticks , that they are the same . If you got dual channel support on your
motherboard , get a dual channel memory kit, if you got triple channel support, use only a triple channel kit. if not and
you go with single dimm's make sure they are the same voltage and timings . I think that if you use them together
the bios is going to chose the lower voltage for all sticks and that is where you may have issues