I need to look into how the 5800X3D scales with faster RAM to get an idea of the 5700's scaling, can't imagine if you used 3600 DDR4 it'd be THAT hampered (?)
A quick look at someone on Reddit doing that shows a 0-9% improvement (usually barely 2%) from 3200>3733 so I reckon i'd be safe with my 3600 for now.
i seen the 5800x3d dose scales with faster RAM ISH! but 3600mhz low latency is all you need really.