Same DDR4 2400 stick accepted by a mobo but rejected by another

[GameplayAlex]

Hi, I built an ASUS H110M-C + i5 6500 system and an ASUS H110i-Plus + i7-6700 system.
In the H110M + i5 6500 I used 2 HyperX 2133 DDR4 8GB sticks and it all went smoothly.
In the H110i + i7 6700 I used 2 HyperX 2400 DDR4 8GB sticks and it wouldn't boot.
I got the long+short+short beeps, meaning no memory detected.

The strange thing is that when I swapped sticks, the H110M + i5 6500 did boot and run smoothly with the DDR4 2400 modules, working at 2133 MHZ.

So I placed the DDR4 2133 sticks in the H110i +i7 6700 and it runs smoothly now too.

My question is why ? Why does a board reject the sticks that another board with the same chipset accepts ?
Does the CPU have anything to do with it ? Revision number ?
Old Bios ?

I really don't think features change on the chipset depending on the size of the motherboard, one being micro ATX and the other one being Mini ITX.

thanks

 

[Tradesman1]

Probably a difference in the BIOS, the one may not havve been able to make adjustments with the sticks, chances are next BIOS update may have a fix for that (or not ) and option might be to try starting with a single stick and set up manually

 

[GameplayAlex]

Hi, I did not try a BIOS update because the second system was close to my house so I just took the HyperX Fury 2400 to my H110M+ i5 6500 system and saw it worked, then took my HyperX Fury 2133 to the i7 system and it worked too, so I left it that way.

On the H110i I tried no stick, 1 stick left slot, 1 stick right slot, the other sick left slot and right slot and all I got was the same beep pattern (long+2 short) with the 2400 memory.

AS i think both motheboards accept XMP profiles and have a list of vendors and state they can run higher than 2133 Mhz memory, it is still a weird glitch.
Could it be related to the specific HyperX Fury DDR4 2400 model and the bios version on the H110i ?
thanks

 

[Tradesman1]

Yes, that could well be it