Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high bandwidth ("double data rate") interface.
Released to the market in 2014,[2][3][4] it is a variant of dynamic random-access memory (DRAM), some of which have been in use since the early 1970s,[5] and a higher-speed successor to the DDR2 and DDR3 technologies.
DDR4 is not compatible with any earlier type of random-access memory (RAM) due to different signaling voltage and physical interface, besides other factors.
DDR4 SDRAM was released to the public market in Q2 2014, focusing on ECC memory,[6] while the non-ECC DDR4 modules became available in Q3 2014, accompanying the launch of Haswell-E processors that require DDR4 memory.[7]
