SRAM (lower density, higher speed)

used in CPU register file, on- and off-chip caches.

DRAM (higher density, lower speed)

used in main memory

Innovation targeted towards higher bandwidth for memory systems:

• SDRAM - synchronous DRAM
• RDRAM - Rambus DRAM
• EDORAM - extended data out SRAM
• Three-dimensional RAM
• hyper-page mode DRAM
• video RAM
• multibank DRAM
• others