Ram Types, Usages, And Capabilities

Front 1

SRAM (Static RAM)

Back 1

Usage: L1 and L2 Cache
Capabilities: Very fast; does not need to be refeshed

Notes: Very large, very expensive

Front 2

DRAM (Dynamic RAM)

Back 2

Usage: Main memory, expansion cards
Capabilities: Smaller and less expensive then SRAM

Notes: More complicated and slower then SRAM, this memory is considered outdated

Front 3

FPM RAM (Fast Page Mode RAM)

Back 3

Usage: Main memory, video memory
Capabilities: Does not need a row and column for each access; does not require special support

Notes: Slowest type of memory in modern PCs. This memory type is considered outdated.

Front 4

EDO RAM (Extended Data Out RAM)

Back 4

Usage: Main memory, video memory
Capabilities: One access to the memory can begin before the last one has ended

Notes: Does not work well at 75 MHz and beyond, same cost at FPM RAM

Front 5

SDRAM (synchronous DRAM)

Back 5

Usage: Main memory, video memory
Capabilities: Synchronized with the system clock and can read/write in burst mode at speeds of 100 MHz and higher.

Notes: Supports internal interleaving, allowing one access to begin halfway through a previous one

Front 6

DDR SDRAM (double data rate synchronous DRAM)

Back 6

Usage: Main memory, video memory
Capabilities: Doubles bandwidth by transferring data twice per cycle

Notes: More expensive than SDRAM

Front 7

DRDRAM (direct Rambus DRAM)

Back 7

Usage: Main meory, video memory
Capabilities: Based on a high speed 16-bit bus with a clock rate of 400 MHz

Notes: Proprietary to Intel and Rambus

Front 8

SLDRAM (synchronous link DRAM)

Back 8

Usage: Main memory, video memory
Capabilities: Uses a 64-bit bus running at 200 MHz clock speed transfering data twice on each cycle

Notes: Open standard