How can you tell in Windows if it's a Samsung or Micron memory?
In Windows:
Back up bios via GPU-Z.
Open the bios in RBE and go to VRAM tab.
If you see only K4Z80325BC, it is Samsung memory.
If you see K4Z80325BC & MT61K256M32, you cannot know it is Samsung or Micron cause this bios is written for Samsung & Micron.
K4Z80325BC states Samsung.
MT61K256M32 states Micron.
I advise you use HiveOS. HiveOS tells the memory in Overview page.