What to set the frequency of RAM?

Question

Iron

Hello everyone
Build:
Processor: Intel Core i5 4670
Memory: Kingstone HyperX Savage 2x4Gb (HX324C11SR/4).
Mother: ASUS Maximus VI Extreme (Z87) The
memory runs at 2400MHz, while on the Intel website it is indicated that the processor supports a maximum of 1600MHz. (At the moment the system works stably, without crashes).
I can’t understand why at a frequency of 2400 the bandwidth is 12800, because it should be 19200.

If this limitation is related to the processor, but what happens if you insert a processor into socket K (They all have a maximum memory support frequency of 1600)?

In any case, I wanted to change the processor to K, so the question is, will the memory work at 2400 with such a processor, or can I return the memory and take the usual one at 1600?
And what frequency to set at the moment? 1600 or 2400?

Answer 1

CPU-z on the SPD tab writes what is in the SPD of the module, and not the current state. The current state is in memory. And Max Bandwidth indicates the maximum standard JEDEC mode.
Nothing will change.
There will be both processors.
XMP profiles - Intel development is. In the specifications, Intel has long been underestimating the memory modes relative to the supported memory frequency dividers. De jure - overclocking, de facto - automatic tuning. About 10+ years ago, I came across memory with a separate instruction saying that the declared mode of memory operation has been tested, but you must configure it yourself in the BIOS.
Which one do you want.