x99 just doesn't like hynix or probably micron memory either
Samsung b-die works very well 3200C14 at default timings 14-14-14-34
Where as 2666C15 is just pure garbage
I had some 2666C16 worked very well for the first couple years on x99 ran 2800 off xmp profile 2
Like a smuck I sold it for C15 thought it would be better wouldn't run 2666 reliably
tested 2101 on my ASUS X99-Deluxe II.
My OC in signature is still stable, as with former Bios 1902 : Realbench 8 hours stress test passed, HCI Memtest 1000% passed and Aida64 Cache stress test 4 hours passed.
No issues so far.