Why is XMP RAM profile not applied?

Question

Iron

Hello.
I have 2 Kingston HyperX Predator sticks from the 32Gb kit. The base frequency is 2400 and there are two XMP profiles - 2666 and 3000.
Recently, the Asus Z370 motherboard was replaced with a Gigabyte Z370.
In Asus, the Xmp 3000 frequency was displayed both in the Windows 10 Task Manager and in the CPU-z utility.
The new motherboard has a different BIOS, but it is possible to select the desired XMP profile. However, in the OS, the correct frequency is displayed only in the task manager, CPU-z and other programs show 1400 (2800/2). And sometimes even 1333. The numbers dance and the memory works, judging by the benchmarks at a reduced frequency.
Maybe something needs to be additionally tweaked in the AORUS Z370 Ultragaming WiFi BIOS or there is not enough voltage or something else? There were no problems with Asus - I set the profile, everything is displayed correctly everywhere.
Why are frequencies cut? BIOS flashed with the latest version. The 8086k processor is stable at 5.2Ghz. Voltage per core 1.350v. But even without overclocking, on a cold XMP system, the RAM profile is buggy.
Thank you.

Answer 1

in the docks on motherboards, manufacturers do not just lay out footcloths with compatible memory models. 3000 and higher for ddr4 is the norm only in theory, in practice breaks are easily possible.
It is treated either by updating the BIOS or by replacing the glands or in no way.
well, in general, for practical problems, the usefulness of such a high frequency is doubtful, except for a very narrow range of tasks.