Two sticks of memory operate at different frequencies, why?

Question

Iron

I bought myself another 8 gig memory stick, since mine is no longer on sale. Both have the same frequency and timings, judging by the information in the online store, but the one that I had earlier now works at a reduced frequency of 1333 and lower timings. I tried to use mem ok, it didn’t work, I set the characteristics in the BIOS, but they only apply to a new memory bar. It seems that for her 1333 is a normal frequency. The system works without blue screens yet, only periodically there are cursor freezes for 3-5 seconds. What else can you try? Downgrade to 1333, but I don't want to?)

I had: Memory Kingston DDR3-1600 8192MB PC3-12800 HyperX ...
Bought this one: Memory Kingston DDR3-1600 8192MB PC3-12800 HyperX ...
This is what cpu- z:

What do these 4 bars mean? What modes do they support? But they are not the same

Answer 1

Did you mix up the planks?
According to you, KHX16C10B1R was installed: www.kingston.com/datasheets/KHX16C10B1R_8.pdf
Now added: www.kingston.com/dataSheets/HX316C10FR_8.pdf
The first one is:
It will not automatically enter the nominal DDR3-1600 mode. Only with manual setting.
The second - JEDEC 1600 is flashed in SPD. On the screenshots of the SPD, you can just see one native DDR3-1600, the second is flashed only DDR3-1333
anyway, the memory controller cannot clock modules with different parameters. They always work all in some one mode, which they jointly agreed upon at the start.
Since both are sold as ddr3-1600, set this mode manually in the BIOS.

Answer 2

Your screenshots are only TTX, in fact, the RAM works at a level with less RAM bandwidth. Maybe a bad example, but still imagine two PCs on a local network and connected through a router with a bandwidth of 100Mbps, but two PCs have 1000Mbps network cards. The speed theoretically and practically between them will not rise above 100Mbps.