DDR3 SDRAM

DDR3 SDRAM , or only DDR3 (Double Spleen Three Synchronous Dynamic Random Access Memory Dated), is the name of a new standard of Computing memory successor of the memory DDR2 SDRAM.

Overall picture

The energy consumption of memory DDR3 is of 40% lower than that of memory DDR2. This is allowed by a fall of the voltage used, 2.5 V on GDR with 1.8 V on the DDR2 and 1.5 V on the DDR3. The intricacy of engraving of DDR3 does not exceed 90 Nanomètre S; this technology allows a reduction of the use of the Electric current and electric Tension of operation. Moreover, transistors with two grids (" dual-gate") are used to reduce the escape of electric current.

The Buffer memory of preliminary proof reading for the DDR3 is of a width of buses of 8 Bit S, whereas it was of 4 bits for the DDR2 and 2 bits for GDR.

Theoretically, the bars of memory DDR3 can transfer the data to a flow are equivalent to more than 10 Go/s. Such a Band-width is really exploited on current architectures only in the graphic field, for which the transfers of information between memories of image are necessary.

Latency was not improved on the DDR3: the DDR3-1600 reach timings of 7-7-7. In comparison, the timings of the best DDR2-400 and DDR2-800 are 2-2-2 and 3-3-3. Being a question of cycle of clock, it is necessary to refer to the frequency which is double here in DDR3; the timings are thus far from different between these two standards from memory.

The 40inches.com mark was the first with launching the marketing of this type of bars in May 2007 to Japan, that is to say two years after the first prototypes, whereas the first mother charts supporting memory DDR3 appeared with the living room of Computex at the beginning of June 2007 in Taipei. They were based on the chipset P35 Express from Intel.

A guide price for a kit 2x1024Mo in October 2007: approximately 300€ in DDR3-1333 (PC3-10666), against 150€ in DDR2-1066 (PC2-8500), 70€ in DDR2-800 (PC2-6400), and 90€ in DDR-400 (PC-3200).

The memory GDDR-3 as for it is intended for the market of the graphics cards, and cannot be comparable with the DDR3.

Specifications standards

Chips

DDR3-800 : Memory chips DDR3-SDRAM designed to be given rhythm with 100 MHz and the clock of i/o to 400 MHz.
DDR3-1066 : Memory chips DDR3-SDRAM designed to be given rhythm with 133 MHz and the clock of i/o to 533 MHz.
DDR3-1333 : Memory chips DDR3-SDRAM designed to be given rhythm with 166 MHz and the clock of i/o to 667 MHz.
DDR3-1600 : Memory chips DDR3-SDRAM designed to be given rhythm with 200 MHz and the clock of i/o to 800 MHz.

Bars of memory

PC3-6400¹ : Bar of memory DDR3-SDRAM conceived to be given rhythm with 400 Using MHz of memory chips DDR3-800, with a band-width of 6,4 Go/s.
PC3-8500¹ : Bar of memory DDR3-SDRAM conceived to be given rhythm with 533 Using MHz of memory chips DDR3-1066, with a band-width of 8,53 Go/s.
PC3-10600¹ : Bar of memory DDR3-SDRAM conceived to be given rhythm with 667 Using MHz of memory chips DDR3-1333, with a band-width of 10,66 Go/s.
PC3-12800¹ : Bar of memory DDR3-SDRAM conceived to be given rhythm with 800 Using MHz of memory chips DDR3-1600, with a band-width of 12,8 Go/s.

¹ This denomination could be invited to change since standard JEDEC is not finalized.

Retrocompatibility

The bars of memory DDR3 are not rétrocompatibles with the preceding versions of memory, GDR and DDR2. I.e. a module DIMM DDR3 cannot be used, nor even inserted, in a slit of memory conceived for a different version.

Overclocking

Overclockeurs already carried a barette Micron of 1024MB of DDR3 to 1100MHz (DDR3-2200) (!) on a chipset Intel P35, a mother chart Gigabyte P35T-DQ6 validation x86-secrecy and also with 1500MHz (DDR3-3000) , for 2x512Mo of memory Have-Dated, also with a chipset P35 but on a mother chart Asustek P5K… validation x86-secrecy

See too

SDR SDRAM
GDR SDRAM
DDR2-SDRAM
RDRAM
Fully Buffered DIMM
Channel dual

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