The DDR4 specification was finalized in September 2012, but its adoption was delayed after prices of DDR3 stabilized last year. Price stability generated higher profit margins for memory makers such as SK Hynix, Samsung and Micron, which continued making DDR3 instead of moving over to DDR4, which would have cost more to produce. Intel and Advanced Micro Devices stuck to DDR3 in thin and light laptop designs, which were intended to resuscitate the slumping PC market.
The DDR4 bus clock speed tops out at 3200MHz, an improvement from 2400MHz for DDR3. DDR4 also has more features to prevent data errors.
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