The difference between first and second memory

Second-generation memory and the difference between third-generation memory I often go to the store to buy electronic products, see the memory a second and third generation of the difference, I ask, what is essentially the difference? What is the role and functions different?

Computer manufactures are always looking for the next best technology, and thanks to an impressive bit of materials science, a little-used form of random access memory (RAM) could soon be taking over the insides of your personal computer. That’s because materials scientists in China have recently found a way to speed up—by more than a factor of 10—so-called phase-change random access memory (PCRAM), which can hold onto information even when your computer’s power is off.

For decades, computers have been getting smaller, faster, and cheaper. But advances in memory technologies have slowed in recent years, prompting researchers to consider alternatives. Dreamed up in the 1960s, PCRAM has always been a promising candidate for RAM—the rewritable scratch pad that a computer’s central processor uses while making its calculations. But it was much slower than most common forms of RAM—including static RAM (SRAM) and dynamic RAM (DRAM)—which can hold information only temporarily.

In general we can say, the speed is main difference in generation of memories.