Hipster

Hynix does NOT use definitions like MFR, AFR, etc for distinguishing Die Generation. The only one letter is defined for it, C-die, B-die, A-die, etc. The letters F and R do not provide information on Die Generation. I suggested you to check this out with google, but you seem to be smarter than I expected. OK, below you can find the download links to the module datasheets where is what I am talking about. C-die https://www.skhynix.com/product/filedata/fileDownload.do?seq=7742 A-die https://www.skhynix.com/product/filedata/fileDownload.do?seq=7654 M-die https://www.skhynix.com/product/filedata/fileDownload.do?seq=7088

Hynix has never used such a nomenclature. It uses definition like A-die, B-die, C-die, and so on. You can check it out by yourself googling with "site:skhynix.com c-die ddr4 8gb".