DDR和DDR2之间的区别

1. DDR：
DDR代表Double Data Rate(双倍数据速率) 。它用于计算机和笔记本电脑，并且可以在每个时钟周期将双倍的数据块传输到内存中，这就是为什么将其称为双倍数据速率。自从DDR RAM推出以来，已经进行了许多升级，分别称为DDR2，DDR3，DDR4。 DDR RAM的所有新版本均与早期或更高版本的RAM不兼容。这意味着DDR2，DDR3，DDR4内存模块将不兼容，也不适合主板上DDR或DDR1插槽中的任何插槽。

2. DDR2：
DDR2代表Double Data Rate版本2，它是DDR存储器的第二个版本。开发此版本的RAM是为了实现块传输的高数据速率。它是DDR的后继产品，其主要变化被应用于RAM芯片和预取缓冲器之间的工作频率，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之间的区别：

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.