The general idea of SDRAM was described in the 1970s, shortly after the mass-production of DRAMs was initiated. However, the device considered to be the inflection point for SDRAM, the basic technology we use for RAMs in our computers today, was the development of the Samsung KM48SL2000 in 1993 (original press release here). It was the first compelling SDRAM device that helped replace all other DRAMs in computers by about 2000. The device achieved 100 MHz speeds in a JEDEC standardized PC100 configuration. Other types of SDRAM included PC66 on the low-end and PC133 on the high-end.