| Evolution of Memory | ||||
| Year | Type | Volts | Freq | Timing |
| 1968 | RAM | 5.0v | 4.77MHz | |
| 1970 | DRAM | +5v,-5v,+12v | 4.77-40MHz | 5-5-5-5 |
| 1971 | ROM | 3.3-5.0v | ||
| 1974 | MRAM | 0.0v | ||
| 1983 | SIMM | 5.0v | 33 MHz | |
| 1987 | FPM DRAM | 5.0v | 16-66 MHz | 5-3-3-3 |
| 1995 | EDO DRAM | 5.0v | 33-75MHz | 5-2-2-2 |
| 1995 | BEDO DRAM | 5.0v | 60-100MHz | 5-1-1-1 |
| 1996 | SDRAM | 3.3v | 60-133MHz | 5-1-1-1 |
| 1996 | SLDRAM | 3.3v | 800MHz | |
| 1997 | DIMM | 3.3v | 66MHz | 5-1-1-1 |
| 1997 | PC66 | 3.3v | 66MHz | 5-1-1-1 |
| 1998 | PC100 | 3.3v | 100MHz | 4-1-1-1 |
| 1999 | DRDRAM | 2.5v | 800MHz | |
| 1999 | PC800 RDRAM | 3.3v | 800MHz | |
| 1999 | PC133 | 3.3v | 133MHz | 2-2-2 |
| 2000 | PC150 | 3.3v | 133MHz | 2-3-2 |
| 2000 | DDR SDRAM | 2.5v | 266MHz | CL=2.5 |
| 2000 | MicroDIMM | 3.3v | 100MHz | 2,3 |
| 2001 | EDRAM | 1.2v | 450MHz | 15-35ns |
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Last Update: 11:08 PM 4/14/02