Difference Between Sdram and Ddr
In the world of computer memory, two terms that are commonly used are SDRAM and DDR. While they are both types of memory, they have significant differences that set them apart. In this article, we will explore the differences and similarities between SDRAM and DDR.
What Is SDRAM?
SDRAM stands for Synchronous Dynamic Random Access Memory. It is a type of computer memory that is synchronized with the system bus, which means that data can be transferred to and from the memory at the same time as the system clock. SDRAM is an improvement over earlier types of dynamic random access memory (DRAM) because it eliminates the need for the memory controller to wait for the memory to become ready before transferring data.
What Is DDR?
DDR stands for Double Data Rate. It is a type of SDRAM that can transfer data twice as fast as regular SDRAM. DDR was introduced in 1999 as DDR SDRAM, and it quickly replaced regular SDRAM as the standard type of memory used in computers.
What's the Difference Between SDRAM and DDR?
The main difference between SDRAM and DDR is that DDR transfers data on both the rising and falling edges of the system clock, while SDRAM only transfers data on the rising edge. This means that DDR can transfer twice as much data as SDRAM at the same clock speed.
Another difference between the two is the way they are named. SDRAM is named according to its speed, such as PC100 or PC133, while DDR is named according to its generation, such as DDR, DDR2, DDR3, or DDR4.
What's the Relationship Between SDRAM and DDR?
DDR is a type of SDRAM, so all DDR memory is SDRAM, but not all SDRAM is DDR. DDR memory has the same basic architecture as SDRAM, but it uses a different method of transferring data.
What Is the Similarities Between SDRAM and DDR?
Despite their differences, SDRAM and DDR have several similarities. Both types of memory are volatile, which means that they require power to retain data. They also have similar physical characteristics, such as the number of pins they use and their form factor.
Table of Comparison
To summarize the differences and similarities between SDRAM and DDR, we have created a table of comparison:
| SDRAM | DDR | |
|---|---|---|
| Method of transferring data | Transfers data on the rising edge of the clock | Transfers data on both the rising and falling edges of the clock |
| Naming convention | Named according to its speed, such as PC100 or PC133 | Named according to its generation, such as DDR, DDR2, DDR3, or DDR4 |
| Type of memory | SDRAM | DDR SDRAM |
| Volatility | Volatile | Volatile |
| Physical characteristics | Similar number of pins and form factor | Similar number of pins and form factor |
Conclusion
SDRAM and DDR are two types of memory that are commonly used in computers. While they have several similarities, such as their volatility and physical characteristics, they have significant differences in the way they transfer data and are named. DDR is a type of SDRAM that can transfer data twice as fast as regular SDRAM, making it the standard type of memory used in computers today.
