Overclocking
Overclocking is never guaranteed so the presented results may vary from results on other memory kits. I am not recommending overclocking if you do not know what are you doing. High voltages may damage hardware and it will not be covered by warranty.
ADATA used the Hynix IC from the well-known MFR series which is probably the best overclocking DDR4 IC right now. Knowing what IC has been used to manufacture the memory helps us to pick memory profiles if they are available in the motherboard’s BIOS or we can simply compare our settings to the results of other users.
I have used completely manual settings with the results below. The maximum stable clock for our review kit was DDR4-3000 and main timings of 15-16-16-25 1N while the voltage was still at a reasonable 1.35V. This is the setting of much more expensive DDR4 kits where you can also find the Hynix IC. The memory bandwidth results at DDR4-3000 are below.
The maximum possible clock on the tested ADATA memory was DDR4-3200 CL16 1.35V. It is really a great result considering it is only a memory designed to run at 1066MHz (DDR4-2133).
I was not able to stabilize these settings as the memory required higher voltage; and at the same time this could not boot at anything above 1.37V.
CPU-Z validation file can be found here.
Below is a short table of the other results achieved on the ADATA 16GB DDR4-2133 CL15 memory kit. As you can see, all of the below results passed stability tests except for DDR4-3200 which has already been mentioned.