DDR4 overclocking at > 4000Mhz.: frequency holes?

[magellan]

What I mean by frequency holes are frequency ranges where the memory can't train successfully. For example, I seem to hit a hard wall at ~4007 Mhz. w/my sticks+motherboard+CPU but is it possible that at a higher frequency it would be stable?

 

[EarthDog]

That used to be a thing generations ago... not sure if it still is.

Try it...

 

[Woomack]

It depends on the motherboard and available ratios, but on DDR4 chipsets, it should work fine up to 4400 or higher. On many higher series motherboards, unavailable options are greyed-out or hidden.
Dual-rank Samsung doesn't even boot past 4400, so there are not many more options to try.
Sometimes ratios are not working because of BIOS, but it's not happening often at popular or lower frequencies. As I remember, 3733, 3800, 3866, 3933, 4000, 4133, 4200, 4266, 4400, 4533, 4600, and 4800 should work on most motherboards.