Ater been postponing again and again, the JEDEC Solid State Technology Association finally announced the next generation memory specifications, the DDR4 standard specification JEDEC DDR4 (the JESD79-4) today, compared to the current DDR3, it has higher performance, better stability and lower power consumption, the progress is significantly.
The DDR4 memory followed the DDR essence architecture, the most critical mission is to enhance the naturally frequency, and many other improvements are also closely related to it. Its take-off data transfer rate is 1.6GT/s, the initial maximum value is 3.2GT/s, which is equivalent to the minimum DDR4-1600, the highest DDR4-3200, but the legendary DDR4-4266 has yet been joined. Taking into account that DDR3 has greatly exceeded the initial design of 1.6GT/s, the DDR4 continued improving possibility is also very large, but if the higher specifications can become a standard specification is not sure to say.
DDR4 also provides three data width x4, x8, x16, single memory particles capacity is 2Gb-16Gb.
In addition to accelerating the reduction voltage is the task of each generation DDR memory, DDR4 again reduced the standard voltage to 1.2V, which is the new JEDEC POD12 standard. The first three generations voltage standards are 2.5V, 1.8V, 1.5V, but it seems that the DDR4 has no low-voltage version now.
DDR, DDR2, DDR3 are separately 2n, 4n, 8n prefetch, every generation has been doubled, but the DDR4 still stay in the 8n prefetch, which means the internal data rate is 1/8 of the external frequency. The bank group can select two or four, which allows DDR4 memory separately within each individual bank group to perform activation, read, write, or refresh operation, and it can improve overall memory efficiency and bandwidth, especially in the small-capacity memory particles.
Stack memory has become a key element of DDR4, which can stack up eight memory devices in single signal Loading.
Samsung, Hynix, Micron and other manufacturers have gradually fashioned the DDR4 memory samples with different specifications, but JEDEC has not announced the new memory universal roadmap. Taking into account that the Intel Haswell 2014 will begin to support the server level DDR4 memory, the ordinary consumer-level users need to wait until 2015 in order to use DDR4, when DDR3 is completely replace it’s almost 2017.