JEDEC rating for DDR4 is 2133…
Check your CMOS/UEFI battery… if it’s flat & the machine stays switched off for a while, the UEFI will reset to default.
It’s a brand new Gigabyte Aorus Elite x570 board 
And like i said, it showed the 3600Mhz XMP profile selected in the UEFI, but somehow in Windows it only ran at 2133.
I also have that board - don’t enable XMP in basic bios settings, enable it under advanced settings - sorted it for me
That is exactly what i did.
Which BIOS version are you running?
Im on F10 still, that was the latest when i got it and flashed it.
Now there is F11 with some “memory compatibility improvements”, maybe i will flash it again.
Bios version F10J - but im using exactly the same ram as Eighjan - 16GB Hyper-X Predator@3200Mhz. You just reminded me to update my Bios as well.
Brand new 'boards are not immune to being at fault… it’s just extremely rare.
Rare problems can sometimes require a ‘rare resolution’… it may be worth a “remove & re-seat” of as many components as is practical, to ensure that isn’t (part of) the problem… RAM, especially, even swapping slots (long shots are sometimes worth it, for sanity).
It’s working for now, so im not gonna change anything 
Only thing that really annoys me atm is the blackscreens problem with display port.
Ordered new cables yesterday (lindy, supposed to be the best) .
This is my first time using DP and also with a new 144hz monitor.
But the problem seems widespread.
Ryzen works best with these ram speeds. All set by the UEFI D.O.C.P setting:
Ryzen 1xxx series. The inbuilt ram controller is 2666mhz.
Ryzen 2xxx series. The inbuilt ram controller is 2933mhz.
Ryzen 3xxx series. The inbuilt ram controller is 3200mhz.
As long as you have ram that can go up the max of each generation, you’re good. Also make sure ram is plugged into the right dimms as well. Check motherboard manual for that, usually it’s Dimm1 is furthest from the cpu and dimm2 is 2nd nearest with a gap between which are slots 2 and 4.
Got 2 sticks, make sure they’re in 1 and 3 slots.
Doesn’t matter with 4 dimms as you fill the up.
Had few DP problems myself, they’re loose fitting in the Asus G-Sync monitor I have, they get better fitting if you get some with a push button that locks them into place.
And as for previous, never had problems running WoW on a FX8350 up until BFA. 2700x does okay right now, probably going to wait and see how much more improvement the Ryzen 4000 series will give when they come out later in the year.
Most have some kind of colour coding to the slots… that helps.
Some don’t, the x470-F board doesn’t, it’s all black slots. But if you read the manual it should tell you where to put them in if you got 2 dimms.
Got all 4 connected though, moved up to 32gb ram which has helped keep wow happy while running alongside other programs. Win10 hardly pages onto hard disk anymore with virtual ram.
My last build had 32GB 1866 DDR3 for a long while - so I know 32GB is fun to have for a lot of simultaneous uses.
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