3600 (PC4 28800) 18-19-19-39 (1.35v)

3000 (PC4 24000) 15-17-17-35 (1.35v)

2133 (PC4 17000) 13-15-15-28 (1.2v)

Questions:

Are higher numbers (2800, 3000, 3200, 3600) factory stock or factory overclocked?

If NOT overclocking, would higher number make the differences verses using 2133 (or 2400 @ 1.35v)?

If installing higher numbers, would it get hotter or same? Or better question, all 1.35v would be same, yet 1.2v is little cooler since it's "lower" voltage? Again, no overclocking.

I am looking at 2x8GB, since it's in lower $100 (vs. 2x16GB is $200).

Plan to get 6700K (even I am not plan to overclock). I MIGHT look into other CPUs (non-K, etc). I am trying to see if I should get H170 (then of course non-K CPU) or Z170. Would Z170 run overall "faster" (even not overclocking) or "same" next to H170 with same CPU, RAM, etc.

Years ago, we used to talk about "FSB", but not nowadays? Same for RAM timings, it doesn't matter anymore?

Chuck