DDR, DDR2, DDR3, DDR4

DDR

DDR, or DDR1 SDRAM  a class of memory integrated circuits used in computers. developed the initial synchronous dynamic random-access memory (SDRAM) technology to increase its performance.

DDR stands for Double Data Rate, and it provided a substantial boost in the speed of operation over the previous generation of SDRAM technology when it was first introduced.

Applications

• operates on the clock signal and may react to the signal's rising or lowering edge.
• transports data on both the rising and falling edges of the clock signal, which is called double data rate.

Advantages

• the ability to gain data on the rising and falling edges of a clock cycle is DDR memory's major benefit.
• for a clock frequency, it doubles the data rate.
• the data transmission frequency of a DDR200 chip, for example, is 200 MHz, whereas the bus speed is 100 MHz.

Disadvantages

• memory is a fickle thing.
• compared to other solutions, the power consumption is significant.
• manufacturing is a hard task.
• data in storage cells must be updated.
• operates at a slower speed than SRAM.

DDR2

"Double Data Rate 2" is the abbreviation for " DDR2." DDR2 RAM is a speedier and more energy-efficient variant of DDR memory. DDR2 memory may deliver data on the rising and falling edges of the processor's clock cycles, much like standard DDR memory. The amount of work the RAM can accomplish in a given period is practically doubled.

Application

• possible to store data in DDR2 memory when the processor's frequency is increasing or lowering.
• amount of work the RAM can accomplish in a period is practically doubled.

Advantages

• more inexpensive, simpler to buy, and found in almost every computer.
• for gamers who can't spend much, DDR2 is an excellent place to start.

Disadvantages

• any current CPU no longer supports DDR2. Hence, it's no longer relevant.
• have minimal latency. However, their speeds are a little slow.

DDR3

To take the role of DDR2, DDR3 was released and stood for "triple data rate three." As a result, DDR3 chips may run at bus speeds of 400 to 1066 MHz, have capacities of 1 to 24 GB, and utilize a significant amount less power than their predecessors. A desktop computer's DDR3 RAM sticks contain 240 pins. DDR3 RAM sticks for laptop computers have 204 pins.

Application

• a form of SDRAM used in computer systems.
• available in DIMM and SO-DIMM configurations.

Advantages

• a step up from its predecessor.
• refers to the capacity to transport data for I/O at an 8-times quicker rate than memory cells, allowing for higher bus speeds.
• also refers to greater peak throughout compared to previous DRAM memory technologies

Disadvantages

• more costly.
• has a longer CAS delay.
• latencies are numerically more significant because of the fewer clock cycles used to measure them; the actual time interval is usually equal to or lower.

DDR4

DDR4 gives up to a 50% improvement in performance and bandwidth while lowering your total computer environment's power consumption. This is a substantial advancement over existing memory technologies, with up to a 40% reduction in power consumption.

Application

• answered the need for more incredible processing speeds on computers.
• provides higher transfer rates and lower voltage, resulting in lower total power usage.

Advantages

• memory rates start at 2133 MHz, a 33 percent increase over DDR3.
• lowered the amount of power needed to function, as did each subsequent generation of DDR memory. 
• voltages decreased from 1.5 to 1.2 volts this time.

Disadvantages

•  a remnant from another period.
• in the foreseeable future, it may become primarily unimportant.