Introduction to DDR2 RAM Including Its History and Specs

it’s possible for you to find different types of RAM in the market, such asSRAM memoryandDRAM memory.

It replaced the originalDDR SDRAMbut it is replaced byDDR3 SDRAM.

But DDR2DIMMs are neither forward compatible with DDR3 nor backward compatible with DDR.

The combination of these two factors results in a total of four data transfers per internal clock cycle.

The speed of the best DDR2 memory module is at least twice that of the best DDR memory module.

History of DDR2 RAM

In 2001, Samsung produced the first DDR2 RAM.

However, the highest clock rate of the original DDR technology is about 200 MHz (400 MT/s).

There are higher-performance DDR chips, but JEDEC said they will not standardize them.

During the access, the four-bit deep prefetch queue was read or written with four bits.

The design of DDR2 RAM avoided an excessive increase in power consumption.

Nevertheless, as a trade-off factor, the latency of DDR2 RAM will greatly increase.

The depth of the DDR2 prefetch buffer is 4 bits, and the depth of DDR is 2 bits.

However, the typical range is 4 to 6.

Therefore, DDR2 RAM must run at twice the data rate to achieve the same latency.

To maintain signal integrity at higher bus speeds, this packaging change must be made.

The End

To sum up, this post is mainly talking about DDR2 RAM.

After reading this post, you should know its definition, history as well as its specifications.