Correct
I have ordered 2 sets, that is 64GB.
I think I will be ok for a while.
I've ordered two batches of 64GB, I think I'll be ok for a while. 2666 recognized on Asrock x299 motherboard.
I still have four slots available, if needed, I would recommend the same ones.
Regarding settings, temperature, power consumption, etc ... I have no opinion.
I recommend this article.