I have not used davinci resolve, so can not comment on the above messages..
I have a 5900X and 32 gb ram. I have 2 youtube channels, so i edit 1440p videos regularly. The processor is adequate but still i have seen it having troubles when things get intense.... while rendering 2k videos cpu is at 70-80% and ram usage is only around 18-20 gb... I am using VDSC free video editor, it's a very basic lightweight editor. So that could be why im not having RAM issues...
While editing 4k videos then 5900X struggles a lot (cpu at 100%, ram at 24 gb+)... So would recommend you buy 5950X, if budget allows.. In my opinion RAM 32 gb is enough for 1440p and maybe consider 64 gb for 4k. Davinci is a very high end software made for professionals so it uses a lot of ram (I could see people talking about this when i googled). You can try other softwares like adobe premiere pro, etc. ram issue wont be that prevalent. You can check this easily by having task manager open.
Also, yes 5700G is a bit lacking for video editing... Im not surprised it is crashing.