SDR, DDR, DDR2, DDR3, DDR4 SDRAM
We all know that RAM stands for Random Access Memory. As the name implies, RAM is that kind of a memory, which is used for faster and random data access. Unlike the Read Only Memory (ROM), RAM is a volatile memory. The RAM is further divided into Dynamic RAM and Static RAM. Dynamic RAM can be either synchronous or asynchronous. Synchronous DRAM or SDRAM is that type of DRAM, which synchronizes its activities with the CPU clock. Based on the features such as required voltage, data transfer rate, clock speed etc. SDRAM can be divided into multiple different types. In this article, we will talk about different generations of SDRAM i.e. SDR, DDR, DDR2, DDR3 and DDR4 followed by a brief overview of the StarWind RAM Disk.
What is SDR SDRAM?
Single Data Rate Synchronous Dynamic Random Access Memory (SDR SDRAM) is the very first generation of SDRAM. As the name implies, SDR SDRAM gives the data transfer rate of a single word per clock cycle. It means that at any given instance, SDR SDRAM can either read or write but cannot do both simultaneously.
What is DDR SDRAM?
Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM) is the second generation of SDRAM. DDR SDRAM provides the double data transfer rate as compared with SDR SDRAM i.e. it can transfer two words per clock cycle. It means that DDR SDRAM can transfer data during both halves of the clock cycle. DDR SDRAM has various versions depending upon their performance and efficiency such as DDR2, DDR3, and DDR4. These versi ons will be discussed in the proceeding sections of this article.
What is DDR2 SDRAM?
DDR2 SDRAM differs from DDR SDRAM because it can access the data bus twice as faster as compared with DDR SDRAM. This means that DDR2 SDRAM is more performance-efficient in comparison with DDR SDRAM.
What is DDR3 SDRAM?
DDR3 SDRAM is another version of DDR SDRAM and its differentiation is that its power consumption is 40% lesser as compared with DDR2 SDRAM. Moreover, its data transfer rate is also higher than DDR2 SDRAM. It means that DDR3 SDRAM provides a better data transfer rate while optimizing the power consumption up to 40% as compared with the other versions of DDR SDRAM.
What is DDR4 SDRAM?
DDR4 SDRAM is yet another version of DDR SDRAM and it can be distinguished from the other types of DDR SDRAM because it works on a very low operating voltage as compared with all other types of DDR SDRAM. Its data transfer rate is twice as that of the data transfer rate of DDR3 SDRAM. It means that the performance and efficiency of DDR4 SDRAM are far better than all other versions of DDR SDRAM. 
StarWind RAM Disk:
StarWind has recently launched the StarWind RAM Disk  tool, which is a software that provides you with the facility to create a virtual disk out of the space available in the RAM, installed on your computer system. You can use this virtual disk for deployment and testing purposes easily without the need of buying any additional costly hardware device. We know that SDR and DDR SDRAMs are very efficient RAM disks but on the same side, they are very expensive. Therefore, they cannot be used for testing purposes. StarWind RAM Disk is indeed the best solution to this problem.
The main benefits of StarWind RAM Disk are as follows:
In this article, we talked about different types of SDRAM i.e. SDR, DDR, DDR2, DDR3 and DDR4. We looked at how these generations of SDRAM differ from each other in their performance and other features.  We know that every proceeding generation of SDRAM is much better than the previous ones but it is also very expensive. Hence, these fancy disks cannot be used for  testing purposes. This issue is gracefully resolved by StarWind RAM Disk, which creates a virtual disk from the pre-installed regular RAM of a computer system.