DDR - 256MB, 512MB, 1GB, 2GB and 4GB
https://www.epsglobal.com/Media-Library/EPSGlobal/Products/files/virtium/VSFCFast16480.jpg?ext=.jpg&maxsidesize=400
DDR SDRAM was the follow-on technology to SDRAM and is the predecessor to subsequent generations of DDR2 and DDR3.
DDR256M4G
DDR256M4G
Virtium
https://www.epsglobal.com/getmetafile/16d94bbd-da49-479d-8b65-d0530dcee7c9/Virtium