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Memory technology evolution: an overview

of system memory technologies

technology brief, 8

Abstract.............................................................................................................................................. 2

Introduction......................................................................................................................................... 2

Basic DRAM operation ......................................................................................................................... 2

DRAM storage density and power consumption ................................................................................... 4

Memory access time......................................................................................................................... 4

Chipsets and system bus timing.......................................................................................................... 4

Memory bus speed........................................................................................................................... 5

Burst mode access............................................................................................................................ 5

SDRAM technology .............................................................................................................................. 6

Bank interleaving ............................................................................................................................. 7

Increased bandwidth ........................................................................................................................ 7

Registered SDRAM modules .............................................................................................................. 7

DIMM Configurations ....................................................................................................................... 8

Memory channel interleaving .......................................................................................................... 10

Advanced memory technologies .......................................................................................................... 11

Double Data Rate SDRAM technologies ............................................................................................ 11

Fully-Buffered DIMMs...................................................................................................................... 15

Rambus DRAM .............................................................................................................................. 18

Importance of using HP-certified memory modules in ProLiant servers ....................................................... 19

Conclusion........................................................................................................................................ 19

For more information.......................................................................................................................... 20

Call to action .................................................................................................................................... 20

edition

Single-sided and double-sided DIMMs ............................................................................................ 8

Single-rank, dual-rank, and quad-rank DIMMs ................................................................................. 8

Rank interleaving.......................................................................................................................... 9

DDR-1 ....................................................................................................................................... 11

DDR-2 ....................................................................................................................................... 13

DDR-3 ....................................................................................................................................... 14

Module naming convention and peak bandwidth ........................................................................... 14

FB-DIMM architecture.................................................................................................................. 16

Challenges ................................................................................................................................ 17