Zend certified PHP/Magento developer

3600MHz memory doesn’t work to the spec

I’m trying to configure AMD R9 Radeon branded memory kit (model R9S432G3606U2K) to work at it’s specified frequency, which is 3600. The motherboard is Asus Prime B550-Plus and, according to it’s specs, this frequency is well within its capabilities. The bios is updated to the latest, the CPU is 5600X (no OC applied).

Though it seems the only thing I need is to activate XMP/D.O.C.P profile in the bios settings. Then it sets the memory clock target at 3600 (@1.35V), infinity fabric target at 1800, timings all according to SPD. Seems legit and should probably work, but then the system just doesn’t start up.

What’s weird is that the memory doesn’t even have proper SDP modes above 2400MHz. Basically it’s either 2400 or 3600. So is there something I’ve missed (I’m not an overclocking and/or hardware expert), or it’s just a bad kit or a bad match between the kit and the motherboard and there is nothing to do about it?