check bios revisions, kit part numbers, etc....
there are many different variants of the trident z ram with different latencies
for example, I have 32GB of rijpjaws V there are 4 kits listed on PCPartPicker
F4-3200C16D-32GVKA
F4-3200C15D-32GVK
F4-3200C14D-32GVK
F4-3200C16D-32GVK I have this one, but there are 3 other kits with different dies/cas latencies