They can't have all the variable in a youtube video. The length would be gigantic. You can have a nice base line, pick one and do additional research. This video at least gives you something to start with.
Unfortunately is like the new gpus. These rams are being scalped right now. I would settle with a nice ddr4 kit and upgrade when this new technology had matured enough. If you have been following the reviews I don't any gains if your purpose is just gaming.
I've been into computers for about 15 years. Once thing that I've never understood was timings primary and secondary. How to overclock them? Is there a starting point?
I'm sorry if this seems to be a complex question since I would assume there's lot s of variables.