DDR3 RAM and DDR2 Memory Comparison
August 7, 2010
|
Posted by agus
DDR3 SDRAM is an improvement over its predecessor, DDR2 SDRAM, and the two are not compatible. The primary benefit of DDR3 is the ability to transfer at twice the data rate of DDR2 (I/O at 8× the data rate of the memory cells it contains), thus enabling higher bus rates and higher peak rates than earlier memory technologies. In addition, the DDR3 standard allows for chip capacities of 512 megabits to 8 gigabits, effectively enabling a maximum memory module size of 16 gigabytes.
Physically, DDR3 memory modules are not much different from DDR2 memory modules. Both have a total of 240 pins on the memory module. The only apparent difference will be the location of grooves on the module. This is done so users will not go wrong installing memory into a personal computer.
Speed and Memory Bandwidth
The main purpose of the DDR3 memory standard is to increase the memory speed and bandwidth in the above specification of the older DDR2. Original DDR memory module (standard) runs between the effective clock speed of 200 and 400MHz. DDR2 Standard double this, ie between 400 and 800MHz. DDR3 is set to two times the speed of DDR2 memory with clock speeds between 800MHz and 1.6GHz.
Although the DDR2 memory standard in real only increased the speed of 800MHz, there are modules that are sold that can run at a speed of 1066MHz. Technically this overclocked modules JEDEC standard modules as the unofficial specifications that support speeds higher than 800MHz. This is often handled by requiring the memory modules that are executed with a higher voltage or different latencies to improve speed.
Lower Power Consumption
The other major advantage of the new memory standard is a reduction of the voltage used for memory modules. DDR standard modules run at 2.5V original. A significant power reduction that has been created on the 1.8V DDR2 standard. With a lower voltage level, needs less actual power of personal computers to run the memory subsystem. DDR3 look further reduce power usage by dropping the voltage level to the point of 1.5V. This decline also occurred in the standard DDR2 from DDR, but did not reduce overall power consumption.
Increased latency
In order to increase the speed DDR3 memory modules, it should also improve latency modules. Latency is the amount of time needed to process orders the memory modules within a few hours or a command cycle. The higher the latency, the slower memory to process orders.
JEDEC (Joint Electron Device Engineering Council) standard latency typical for DDR2 is 5-5-5-15. JEDEC standard latencies for the newer DDR3 memory are 7-7-7-15. Even with the increase in latency for DDR3 memory, a higher clock speed allows the memory still has a greater bandwidth than the old standard. This causes the DDR3 memory running at 800MHz to be slightly slower than DDR2 memory which is also running at 800MHz. Real benefits obtained from a clock speed higher than this standard.
Another thing related to the latency that must be considered is that this is standard. As manufacturers increase the memory module, the module will be run at lower latencies than JEDEC specifications. It is possible to find a faster DDR2 memory at the present rate 5-5-5-15. This will take some time for DDR3 to get below the JEDEC latencies.
Incoming search terms for the article:
- ddr3 vs ddr2
- ddr2 ddr3
- DDR2 vs DDR3
- ddr2 or ddr3
- ddr3 ddr2
- ddr3 memory comparison
- ddr2 vs ddr3 memory
- looking comparison to older and new memory module
- DDR2 vs ddr3 memory 2010
- ddr3 vs ddr2 2010
- ddr3 or ddr2
- ddr3 ram module and bus standards/bandwidth
- ddr3 ram benifits over ddr2
- ddr3 versus ddr2
- ddr3 ram speeds
- ddr3 versus ddr2 speed comparison
- DDR3 Memory vs DDR2
- ddr3 memory speed comparison
- ddr3 ram versus ddr2 ram
- ddr3 vs ddr2 sdram
Categories: Uncategorized
| 
Tags: ddr2 ddr3, ddr3 ddr2, ddr3 or ddr2, ddr3 vs ddr2, looking comparison to older and new memory module
|
No Comments
