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 | Kommentar
Fra :  IBM760  |
Dato : 30-07-04 15:31 |
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Hej Karsten,
tedd har formodentligt ret, prøv at se følgende side:
http://www.kingston.com/newtech/overview.asp
Citat
DDR Memory Overview
DDR SDRAM, or simply DDR, is the acronym for Double Data-Rate Synchronous DRAM (SDRAM).
DDR is a memory technology that is considered 'evolutionary' as it is based upon the stable and mature PC133 or PC100 SDRAM technology.
A 100MHz SDRAM chip handles a single memory operation per clock cycle; its data rate is effectively 100MHz x 1 or 100MHz. Similarly, a PC133 SDRAM chip has a data rate of 133MHz. PC100 and PC133 are in effect 'Single Data-Rate' SDRAM.
DDR memory chips can do 2 operations during a single clock cycle. A 100MHz DDR memory chip's data rate is thus 100MHz x 2 or 200 MHz. A 133MHz DDR memory chip has a data rate of 133MHz x 2 or 266MHz.
Technically, the DDR memory bus runs at memory-bus clock rate of 100 MHz for PC1600, 133 MHz for PC2100, 166 MHz for PC2700 and 200MHz for PC3200. However, each DDR memory module and memory chip run at an effective (data) rate of 200 MHz, 266 MHz, 333 MHz and 400MHz respectively. The computer industry has adopted a practical convention of just referring to the data rate as the DDR DIMM speed. So, PC1600 DIMMs are said to run at 200 MHz, PC2100 DIMMs at 266 MHz, PC2700 DIMMs at 333MHz and PC3200 DIMMs at 400MHz.
PC1600 PC2100 PC2700 PC3200
200MHz 266MHz 333MHz 400MHz
JEDEC has defined the specification for PC1600, PC2100, and PC2700. Other specifications, such as PC3200, were originally defined by DRAM manufacturers, chipset, and motherboard manufacturers, and then were to be finalized by JEDEC.
Because of demand from computer enthusiasts, gamers, and selected system builders, Kingston has launched 434MHz modules as well. The specifications for these modules were defined by major chipset and motherboard companies.
DDR memory enables a new generation of higher performance, lower-cost computer systems, including desktops, workstations, servers, notebooks, and compact- and sub-compact computers, as well as new communications and networking products such as routers and switches.
Major technology and chipset companies, including Intel Corporation, Advanced Micro Devices (AMD), VIA Technologies, Acer Labs (ALi), Silicon Integrated Systems (SiS), nVIDIA, ATI and ServerWorks have announced support for DDR memory across different platforms. |
Mvh Ivan
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 | Godkendelse af svar
Fra : KaVAkandu  |
Dato : 30-07-04 15:51 |
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