GIGABYTE GA-B250M-DS3H dual channel RAM problem

[ambrella751]

Hello all!

I have two memory kit of RAM 2x4Gb.

Crucial Ballistix Sport LT Red 8 Kit (4GBx2) DDR4 2666MHz
and
Crucial Ballistix Sport LT Gray 8 Kit (4GBx2) DDR4 2666MHz

If I put one kit in MB all works fine but if I add second kit, MB not run. Also work if I install one DIMM from any kit. Problem persist only when I add second one or two module from kit of RAM.

BIOS I have updated to latest F8 version.

 

[Calvin7]

Memory manufacturers guarantee compatibility for memory in the form it is sold in and combinations made by matching up identical part numbers carry no guarantee to work together.

I suggest you return the memory.

Workarounds for getting extra memory to work include:
Lower memory frequency
Relax DRAM timings
Increase DRAM voltage
Lower CPU multiplier

 

[ambrella751]

This is the same modules and chips. Difference only in color of radiators. I want understand why MB not accept all modules, only one set.

 

[Calvin7]

The added stress on the memory controller causes the memory to be unable to operate at rated specifications. It may be possible to get the combination to run at slower memory clock speed.

The old memory has never been tested with the new memory, hence no guarantee.

If you choose to make such combinations, you assume a "do it yourself" compatibility testing basis.

>G. Skill FAQ:
https://www.gskill.com/en/faq/DRAM_Memory

Q:
I want to install more memory, in addition to my existing memory kit. What are my options?

A:
We do not recommend mixing memory kits, regardless of brand or model.

By mixing memory kits together, there may be compatibility issues such as unable to boot or unable to operate at rated specifications.

Each of our memory kit are thoroughly tested to ensure compatibility within each memory kit. And because we have not tested our memory kit with your existing memory kit, we cannot guarantee compatibility when multiple kits are used.

 

[ambrella751]

>The added stress on the memory controller causes the memory to be unable to operate at rated specifications. It may be possible to get the >combination to run at slower memory clock speed.

Did you see I have posted models of memory modules? They identical. Difference only in radiators color.

>The old memory has never been tested with the new memory, hence no guarantee.

Why you speak about old modules?