i have asrock z170 extreme 7+ i already had 8 gb (2*4) installed and works PERFECT bought another 8 of same kind and tried to install but keep getting code c4 for some reason, anyone know why? i have cleared cmos and bios also
check your motherboards manual for proper placement for your ram sticks. also it is never a guarantee added ram will work with older sticks, even if it is the same make/model. have you tried just running on the new 8gb and removing the old to see if it works?