It seems we are in the same ship. I can't go above 2666 MHz with two sticks(2x16GB) from this memory - Corsair Vengeance LPX 2x16GB DDR4 3000 MHz CMK16GX4M1B3000C15 ver. 5.39(Hynix), Dual Rank, Part Number: H5AN8G8NAFR-TFC, A-die.
A lot of people had a trouble with this RAM model to run it at 2800/2933/3000 MHz.
I tried so many different settings(timings, voltages) and this model(MK16GX4M1B3000C15) refuses to run at specified specs. It seems to be cursed by all the gods and can't work above 2666 MHz on AM4 X370/X470 series motherboards. Nobody takes blame - nor AMD, nor Corsair, nor motherboards manufacturers. They just not put this RAM in QVL and that is, sad story. Wasted money. Shame.
Here is my reply in another forum about this situation.
One of many who has a bad experience with this RAM - read here.
Corsair, do something about it, collaborate with AMD->Motherboard Manufacturers-> and talented people like 1usmus, Reous, to make this dual ranked memory RUN trouble-free at specified frequencies and latency's.
