Memory for 3900x

[iviv]

I keep reading a ton of conflicting information with regards to what speeds and so on to run for Zen 2.

I'm going to be buying a 3900x, and from what I've seen, it's usually fairly easy to overclock the infinity fabric up to 1900Mhz on them, meaning you would want ram that's overclocked to 3800Mhz to match that 1:1 and give the best performance? Though I've also seen people mention that underclocking can also work?
Finally, what's the best option with regards to memory? I was thinking about getting 4x8Gb sticks to future proof the build, but does this hurt much compared to 2x8Gb (Or 2x16Gb?) Though I believe this part is to do with the memory slot layout on the board and if it's T-topology or daisy chain? I've seen these terms thrown around a fair bit but I'm not 100% sure what it actually means.

So, yeah, what's the best option for a 3900x? I don't want to spent a ton if there's only a minimal performance boost, but equally I'm hoping for a good few years out of the system without needing to upgrade.

 

[andy_mk3]

2x8gb or 2x16gb Samsung b.die memory. 8pack 3200mhz ram will OC to 3600+ with low latencies and is a decent price, no need to spend out on 3800mhz memory.

 

[iviv]

Oh yeah, I had no intention of actually buying 3800, just wanted something that could overclock that high, assuming that getting the IF to 1900Mhz and mem to 3800 is better than having them lower with tighter timings?

 

[andy_mk3]

Somewhere around 3600mem/1800if is the sweet spot, you'll get a better advantage running CL14 timings than having to push clocks up.

 

[iviv]

So basically look for a 3600mem kit with the lowest CL timing, then try to tighten them as much as possible?