Download CPU Z or MSI Afterburner, and check at what speeds your RAM is running at and also check their behavior/performance overall.
It could be that your RAM haven't been properly overclocked yet meaning they're still either at 2133Mhz or 2400/2666Mhz depending on motherboards. In which case you need to jump into your motherboard BIOS and manually set your RAM speed to 3200Mhz and set the voltage to 1.35v.
Run the tests again and you will get good results.
If all of this fails, check your motherboard's QVL list on the manufacturer's official website. It could be that your RAM of choice is not in that QVL list, in which case there's nothing you can do. You simply bought RAM that wasn't the best for this motherboard but still works fine.