Double Data Rate Synchronous DRAM (DDR-SDRAM)

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This memory chip consumes less power. DDR memory supports Error Correction Code (ECC) and non-parity. Some of the variations of the DDR RAM available in the market are: 1. DDR 266 2. DDR 333 3. DDR 400 4. DDR2533 5. DDR2667

Double Data Rate Synchronous DRAM (DDR-SDRAM)

DDR-SDRAM stands for Double Data Rate - Synchronous DRAM. It is the latest version of SDRAM. The dissimilarity between SDRAM and DDR is that SDRAM transfers data on the rising edge of the clock signal. However, DDR transfers data on both the edges of the clock signal that is on the rising and falling edges of the clock signal. As a result, the data transfer rate of DDR is sooner than SDRAM. It is almost double the rate of the SDRAM.

This memory chip consumes less power. DDR memory supports Error Correction Code (ECC) and non-parity.

Some of the variations of the DDR RAM available in the market are:

1. DDR 266

2. DDR 333

3. DDR 400

4. DDR2533

5. DDR2667

DDR 266-This is one of the cheapest DDR memories available in the market.

DDR 333

Your motherboard should support DDR 333 for installation and is required for those users who use powerful applications such as video processing software, latest games etc.

DDR 400

DDR 400 memory is recommended for some of the latest motherboards with at least P4 2.8 GHz or above or Athlon 64 Processor and should be operated in dual channel mode for better performance.

DDR2 533 (Double-Data-Rate two)

DDR-SDRAM memory chips specified to run at 133 MHz, I/O clock at 266 MHz. Now DDR2 533 and 667 has just hit the market with latest boards but, its price is very high. These speeds are possible because of additional features such as a larger prefetch and more improvised registers. It is roughly double the rate of DDR memory.

Before installation of these memory modules please ensure that it is compatible with the motherboard. Intel's 925XE and SiS5656 chipset supports DDR2 specification.

Quad Data Rate (QDR) SDRAM

Quad Data Rate (QDR) SDRAM is a type of computer memory, more specifically a type synchronous dynamic random-access memory that can transfer four words of data in e clock cycle. Like Double Data-Rate (DDR) SDRAM, QDR SDRAM transfers data on both rise and falling edges of the clock signal. QDR has separate read and write ports that can opera simultaneously. This requires a larger number of wires from the memory device to the memory controller, but doubles the theoretical maximum data transfer rate.

Random Access Memory (VRAM)

Video adapter or video system uses VRAM. It stores the images that are to be displayed on the computer screen. Before displaying the image on the computer screen, CPU first reads the image from the memory and then writes it in VRAM. This memory acts as a barrier between the CPU and the video card. It provides more bandwidth than DRAM and EDO DRAM.

Synchronous Graphics RAM (SGRAM)

SGRAM is a less expensive approach to speed up memory access for graphics functions. It works simply by speeding up some of the functions. It is not dual ported, as is VRAM, and therefore performance is somewhat lower. This type of memory is generally used in most current mid range graphics adapter. SGRAM is used in AGP Cards.

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lucia anna
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Posted on Mar 13, 2011