| A | B |
|---|
| conventional | 30pin SIMM used in early PCs |
| Fast Page memory (fpm) | 30 & 72pin SIMM and 168 DIMM; improved access time over conventional |
| Extended Data Out (EDO) | 72pin SIMM and 168 DIMM refined FPM |
| Burst EDO | 72pin SIMM and 168 DIMM refined EDO |
| Synchronous DRAM (SDRAM) | runs in sync with the system clock |
| DDR - Double Data Rate Ram | a faster version of SDRAM 184pins |
| Rambus DRAM | is a RIMM; both single and dual channel |
| DDR2 | faster than DDR uses less power; clocks up to 1333Mhz |
| dual channel | memory controller interleave between DIMM pairs |
| DDR3 | faster than DDR2 - runs up to 1600Mhz |
