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Check the speed at the top left corner. you can get into the uefi setup by pressing the delete key during the boot.
Usually they run at 2400 or 2133..Speeds above 2666mhz considered as overclocking.
You can increase it using the x.m.p profiles. MIT -> advanced frequency settings -> Extreme memory profile or manually using the system memory multiplier.
Don't try to push beyond 2666mhz if your memory models aren't on the memory QVL list of your motherboard.
Thanks machan

Since you mentioned not to go beyond 2666mhz, I didnt try any.