It's all Fun & Games ...
Just saw this
https://www.dvhardware.net/article66073.htmlGibbo from OCUK received an update from ASUS that confirms AMD's Ryzen platform has issues with high-frequency DDR4 memory. There were some rumors about this and here we have the first hard confirmation that there's indeed a DDR4 memory compatibility problem.
AMD reportedly focused all its efforts on improving CPU performance and put DDR4 support on the backburner. Motherboard maker ASUS reports you can use DDR4 with a frequency of up to 3200MHz if you populate just two DIMMS on a motherboard, but if you want to use all four DIMMs you can't clock the memory higher than 2400MHz.
This issue is expected to be resolved via a BIOS microcode update, the ETA for this is 1-2 months.