AMD RX570 4GB MSI Armor OC GPU

I saved the bios by using atiflash.
I opened the saved bios by using Polaris Bios Editor.
I see Elpida and Hynix_1 options.
I checked by using GPU-Z. I see Micron.

Which RAM does this GPU have ?

Elpida ?
Hynix ?
Micron ?