Types of  RAM

Different type of  Dynamic ram that is used in desktop computers are

Random Access Memory, DRAM, Dynamic Ram

  • SD RAM
  • RD RAM
  • DDR1 RAM
  • DDR2 RAM
  • DDR3 RAM

Synchronous Dynamic Random-Access Memory (SDRAM)

SD-RAM synchronizes the memory speed with the CPU clock speed. The speed of the SD-RAM depends on the speed of the CPU bus. It is faster as compared SRAM, DRAM, EDO DRAM and VRAM memories. The transfer speed of SD Ram is measured in nanoseconds and megahertz units. It runs with an average speed of 133 MHz’s. SDRAM has speed 100/133 MHz of 168 pins with    3.3 V operating voltage.

Rambus Dynamic Random-Access Memory (RDRAM)

RDRAM is the fastest computer memory. It delivers data very frequently on the data bus and read data on every rise and fall of the clock cycle. As a result, the RDRAM memory has the data transfer speed of 800 MHz. Video memory on the graphics accelerator card and the cache memories use this chip. The high-performance workstations and the servers are using the RDRAM chip. The high bandwidth and low latency applications also use this memory chip.
The RIMM memory model carries the RDRAM chip. RIMM stands for Rambus inline memory module the no. of RDRAM placed on the module depend on the bus width of the Ram. RDRAM (RAM Bus DRAM) of 160 or 180 pins operate at 300-400 MHz


DDR-SDRAM stands for the double data rate  Synchronous DRAM. It is the latest version of SD RAM. DDR is synchronous with the system clock. The dissimilarity between SDRAM and DDR is that SDRAM transfer data on the rising edge of the clock signal. However, DDR transfer data on both edges of the clock signal that is on the rising edge falling edge of the clock signal. As a result, the transfer rate of DDR is faster than DRAM. It is almost twice the speed of the SDRAM
This memory chip consumes less power. DDR support Error Correction Code (ECC) and non-parity


DDR2-SDRAM is the high-performance memory. Over its predecessor, DDR-SDRAM, its offers greater bandwidth and density in a smaller package along with a reduction in power consumption. In addition, DDR2-SDRAM provides new features and functions that enable higher a clock rate and data rate operations of 400 MHz, 533 MHz, 667 MHz, and above. DDR2 transfers 64 bits of data twice in every clock cycle. DDR2-SDRAM RAM is not compatible with the slot of current DDR-SDRAM memory.


DDR3 is the third generation of double data rate (rate) SD RAM memory. Similar to DDR2, it is continuing evolution of DDR memory technology that delivers higher speeds up to 1866 MHz, lower power consumption and dissipation. It is an ideal memory solution where the bandwidth is the major concern for the systems equipped with the dual and quad-core processor and the lower power consumption is a perfect match for both server and mobile platform.

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