DDR4 SDRAM-coming shortly

DDR4 SDRAM, an abbreviation for double data rate type four synchronous dynamic random-access memory, is a type of dynamic random-access memory (DRAM) with a high bandwidth interface currently under development and expected to be released to market in 2012. As a "next generation" successor to DDR3 SDRAM, it is one of several variants of DRAM which have been in use since the early 1970s. It is not directly compatible with any earlier type of random access memory (RAM) due to different signaling voltages, timings, physical interface, and other factors.

DDR4 itself is a DRAM interface specification. Its primary benefits compared to DDR3 include a higher range of clock frequencies and data transfer rates (2133–4266 MT/s compared to DDR3's 800 and higher and significantly lower voltage (1.05–1.2 V for DDR4, compared to 1.2–1.5 V for DDR3). DDR4 also anticipates a change in topology. It discards the multiple DIMMs per channel approach in favor of a point-to-point topology where each channel in the memory controller is connected to a single DIMM. Switched memory banks are also an anticipated option for servers.

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