To elaborate on RTX 2080's post about RAM, I'm sure they mean dual channel (2x4GB sticks) rather than a single 8GB stick.
While more RAM is important, speed is also important.
And yes, I didn't elaborate very well in regards to the max settings VS high settings thing.
It definitely varies depending on game, but what I meant was that in most cases, in regards to "certain" graphic settings, setting the slider to max does practically nothing for you visually except to lower the frame rate.
At 1080p in a lot of cases, these certain kinds of settings don't have much visual difference, and what little difference they have isn't worth the performance hit.
That's what I was trying to get at.
And also to say that while the high preset in a modern AAA title isn't ultra/max settings, it's not bad looking by any means and typically looks better than current gen consoles, which look really good already.