DDR SDRAM
DDR SDRAM is Double Data Rate SDRAM.
DDR SDRAM is an improvement over regular SDRAM, also known as SDR SDRAM (Single Data Rate SDRAM).
DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer.
DDR SDRAM is being supplanted by DDR2 SDRAM.
Standard DDR SDRAM DIMM's
DDR SDRAM is normally packaged in DIMM modules.
| DIMM Module | Chip Type | Clock Speed | Data Rate | Transfer Rate |
|---|---|---|---|---|
| PC1600 | DDR200 | 100 | 200 | 1,600 |
| PC2100 | DDR266 | 133 | 266 | 2,133 |
| PC2400 | DDR300 | 150 | 300 | 2,400 |
| PC2700 | DDR333 | 166 | 333 | 2,667 |
| PC3000 | DDR366 | 183 | 366 | 2,933 |
| PC3200 | DDR400 | 200 | 400 | 3,200 |
| PC3500 | DDR433 | 216 | 433 | 3,466 |
| PC3700 | DDR466 | 233 | 466 | 3,733 |
| PC4000 | DDR500 | 250 | 500 | 4,000 |
| PC4300 | DDR533 | 266 | 533 | 4,266 |
Standards for DDR SDRAM
DDR SDRAM standards are still being developed and improved.
| DDR SDRAM Standard | Frequency (MHz) | Voltage |
|---|---|---|
| DDR | 400-533 | 2.5 |
| DDR2 | 667-800 | 1.8 |
| DDR3 | 1066 to … | 1.5 |
Higher frequencies enable higher rates of data transfer.
Lower voltages result in less heat radiation and longer batter life for portable computing devices. They also allow greater component density, which allows higher capacity in the same package size.
|
|
- DDR3 SDRAM
DDR3 SDRAM (Double Data Rate Three Synchronous Dynamic Random Access Memory) is the third generation of DDR SDRAM. DDR3 SDRAM improves on DDR2 SDRAM in several significant ways: Higher bandwidth due to increased clock rate Reduced power consumption due to 90mm fabrication technology Pre-fetch buffer is doubled to 8 bits to further increase performance The [...]...
- SDR SDRAM
SDR SDRAM is Single Data Rate SDRAM. SDR SDRAM is the original SDRAM standard, which has since been replaced by DDR SDRAM. DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer. Standard SDR SDRAM DIMMs SDR SDRAM is [...]...
- DDR2 SDRAM
DDR2 SDRAM, an abbreviation for double data rate two synchronous dynamic random access memory, is a type of a random access memory (RAM) commonly used in personal computers and various digital electronics today. This offspring from the SDRAM (synchronous dynamic random access memory), a part of DRAM (dynamic random access memory), is like an evolution [...]...
- SDRAM (Synchronous Dynamic Random Access Memory)
SDRAM, or Synchronous Dynamic Random Access Memory, is a type of RAM in which memory is synchronized with the computer’s internal system bus via the use of a clock system. While SDRAM requires that data must wait for a predetermined number of clock signals before it is sent to the memory array, new data can [...]...
- Xeon
Xeon is an marketing name for Intel’s server-class CPUs from the Pentium family. Intel has manufactured and sold Xeon versions of the Pentium II, Pentium III, Pentium 4, and Pentium MP CPUs. Xeon CPUs are differentiated from each other by their CPU speeds, Front Side Bus speeds, and the size of their L2 cache and [...]...