DDR和DDR2的区别

1. DDR :
DDR 代表双倍数据速率。它用于计算机和笔记本电脑，每个时钟周期可以将双倍数据块传输到内存，这就是为什么它被称为双倍数据速率。 DDR RAM自推出以来，进行了多次升级，称为DDR2、DDR3、DDR4。所有新版本的 DDR RAM 都与较早或较新的 RAM 不兼容。这意味着 DDR2、DDR3、DDR4 内存模块将不兼容或无法安装在主板的 DDR 或 DDR1 插槽中的任何插槽中。

2. DDR2 :
DDR2 代表双倍数据速率版本 2它是 DDR 内存的第二个版本。开发此版本的 RAM 是为了实现块传输的高数据速率。它是DDR的后继者，主要变化应用于RAM芯片和预取缓冲区之间的工作频率，并且两个参数的数量都增加了。预取缓冲区是驻留在 DDR2 的 RAM 芯片中的 4 位内存捕获。

DDR和DDR2的区别：

S.No.	DDR	DDR2
1.	DDR has 4 internal banks.	Whereas DDR2 has either 4 or 8 internal banks.
2.	The transfer speed of the DDR varies between 0.20–0.40 gigatransfer per second.	While the transfer speed of DDR2 varies between 0.40–1.06 gigatransfer per second.
3.	The speed of DDR is slower than that of DDR2.	While the speed of DDR2 is higher than DDR.
4.	The DDR was released in the year 1998.	While DDR2 was released in the year 2003.
5.	DDR is succeeded by DDR2.	While DDR2 is succeeded by DDR3.
6.	The standard supply voltage of DDR is 2.5 V.	While the standard supply voltage of DDR2 is 1.8 V.
7.	DDR has a bus clock speed of 100 MHz-200 MHz.	While DDR2 has a bus clock speed of 200 MHz-533 MHz.
8.	DDR has a channel bandwidth of 1.60-3.20 GBps.	While DDR2 has a channel bandwidth of 3.20-8.50 GBps.
9.	Performance wise DDR is not better than DDR2.	Whereas it is better than DDR in terms of performance.