DDR3 topic & tuning

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The memory comes with a promise of a power consumption reduction of 40% compared to current commercial DDR2 modules, due to DDR3's 90 nm fabrication technology, allowing for lower operating currents and voltages (1.5 V, compared to DDR2's 1.8 V or DDR's 2.5 V). ''Dual-gate'' transistors will be used to reduce leakage of current.

DDR3's prefetch buffer width is 8 bit, whereas DDR2's is 4 bit, and DDR's is 2 bit.


Chips
* DDR3-800 : DDR3-SDRAM memory chips specified to run at 100 MHz, I/O clock at 400 MHz

* DDR3-1066: DDR3-SDRAM memory chips specified to run at 133 MHz, I/O clock at 533 MHz

* DDR3-1333: DDR3-SDRAM memory chips specified to run at 166 MHz, I/O clock at 667 MHz

* DDR3-1600: DDR3-SDRAM memory chips specified to run at 200 MHz, I/O clock at 800 MHz


Sticks/Modules
* PC3-6400: DDR3-SDRAM memory stick specified to run at 400 MHz using
DDR3-800 chips, 6.40 GB/s bandwidth

* PC3-8500: DDR3-SDRAM memory stick specified to run at 533 MHz using
DDR3-1066 chips, 8.53 GB/s bandwidth

* PC3-10600: DDR3-SDRAM memory stick specified to run at 667 MHz using
DDR3-1333 chips, 10.67 GB/s bandwidth

* PC3-12800: DDR3-SDRAM memory stick specified to run at 800 MHz using
DDR3-1600 chips, 12.80 GB/s bandwidth

Features
DDR3 SDRAM Components:
* Introduction of asynchronous RESET pin
* Support of system level flight time compensation
* On-DIMM Mirror friendly DRAM ballout
* Introduction of CWL (CAS Write Latency) per speed bin
* On-die IO calibration engine
* READ and WRITE calibration

DDR3 Modules:
* Fly-by command/address/control bus with On-DIMM termination
* High precision calibration resistors

Advantages compared to DDR2
* Higher bandwidth (up to 1600 MHz)
* Performance increase at low power
* Longer battery life in laptops
* Enhanced low power features and thermal design

Disadvantages compared to DDR2
* Commonly higher CAS Latency
* Lower MFIBS per Quad Cycle











DDR3 ramok,chippek--> [link]