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DDR3
High-Performance Memory |
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DDR3 continues the evolution of the DDR and DDR2 technologies to provide continued
improvements in performance.
The DDR3 technology is just being introduced and is not projected to be cost
competitive with the DDR2 technology until 2009 or 2010. However, it does
offer increased transfer rates of PC3-6400 (2.5 ns clock), PC3-8500 (1.875
ns clock), PC3-10600 (1.5 ns. Clock), and PC3-12800 (1.25 ns clock). Thus,
this technology can be a great new outlook for system designs that are performance
driven. DDR3 also saves power by lowering the power supply voltage to 1.5
volts.
- Scalability of Speeds to Reach 1600 Megatransfers
- Available in both Unbuffered and ECC Registered Versions
- Provides the highest transfer rate performance
- 1.8 Volt Operating Voltage
- High density: Up to 2GB
- Available in 240 DIMM and 204 pin So-DIMM Form Factors
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Four standard operating frequencies for the DDR3 SDRAM Memory Module specification
were developed to provide the use with the most suitable option: PC3-6400,
PC3-8500, PC3-10600, and PC2-12800.
PC3-6400 memory module configurations utilize DDR3-800 components to achieve
the highest performance, with a peak bandwidth of 6.4GB/s when used in systems
operating on 400MHz memory clock frequency.
PC3-8500 memory module configurations utilize DDR3-1066 components to achieve
the highest performance, with a peak bandwidth of 8.5GB/s when used in systems
operating on 533 memory clock frequency.
PC3-10600 memory module configurations utilize DDR3-1333 components to
achieve the highest performance, with a peak bandwidth of 10.6GB/s when
used in systems operating on 667 memory clock frequency.
PC3-12800 memory module configurations utilize DDR3-1600 components to
achieve the highest performance, with a peak bandwidth of 12.8GB/s when
used in systems operating on 800MHz memory clock frequency.
DDR3 doubles the bandwidth available to your system once again and runs twice
as fast as DDR3. DDR3 works very similar to DDR2 except that twice the number
of data bits compared to DDR2 (or four times the data bits when compared to
DDR), are fetched internally to enable transferring the sequential data at twice
the speed of DDR2. Like DDR2 the data is transferred on both the rising and
falling edge of the clock cycle enabling DDR3 to literally double the data transfer
rate of the original bus clock. For example; with DDR3 a memory running with
a clock of 533 or 667MHz will yield an effective data rate of 1066 or 1333 mega-transfers
per second (MTS), doubling the data rate.
| WILL DDR3 WORK ON MY SYSTEM? |
DDR2 is an emerging technology that is currently only supported by a
small number of the latest microprocessors. DDR3 DIMM modules are available
in a variety of form factors including 240 pin full-sized DIMM, 204 pin
So-DIMM, and 240 pin Very Low Profile (VLP) DIMMs. These form factors
are not interchangeable with the preceding DDR or DDR2 technology form
factors.
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