DDR3 VS DDR4

DDR4  =2*DDR3 PERFORMANCE

DDR4 is the next evolution in DRAM, bringing even higher performance and more robust control features while improving energy economy for enterprise, micro-server, tablet, and ultrathin client applications. The following table compares some of the key feature differences between DDR3 and DDR4       .intel is behind this new tecnology            

          

			Feature/Option DDR3 DDR4 DDR4 Advantage Voltage (core and I/O)             1.5V 1.2V Reduces memory power demand VREF inputs  2-DQ                              and CMD/ADDR 1 – CMD/ADDR VREFDQ now internal Low voltage standard Yes (DDR3L at 1.35V) Anticipated (likely 1.05V) Memory power reductions Data rate (Mb/s) 800, 1066, 1333, 1600, 1866, 2133 1600, 1866, 2133, 2400, 2667, 3200 Migration to higher‐speed I/O Densities 512Mb–8Gb 2Gb–16Gb Better enablement for large-capacity memory subsystems Internal banks 8 16 More banks Bank groups (BG) 0 4 Faster burst accesses tCK – DLL enabled 300 MHz to 800 MHz 667 MHz to 1.6 GHz Higher data rates tCK – DLL disabled 10 MHz to 125 MHz (optional) Undefined to 125 MHz DLL-off now fully supported Read latency AL + CL AL + CL Expanded values Write latency AL + CWL AL + CWL Expanded values DQ driver (ALT) 40Ω 48Ω Optimized for PtP (point-to-point) applications DQ bus SSTL15 POD12 Mitigate I/O noise and power RTT values (in Ω) 120, 60, 40, 30, 20 240, 120, 80, 60, 48, 40, 34 Support higher data rates RTT not allowed READ bursts Disables during READ bursts Ease-of-use ODT modes Nominal, dynamic Nominal, dynamic, park Additional control mode; supports OTF value change ODT control ODT signaling required ODT signaling not required Ease of ODT control, allows non-ODT routing on PtP applications Multipurpose register (MPR) Four registers – 1 defined, 3 RFU Four registers – 3 defined, 1 RFU Provides additional specialty readout
			so,this concludes DDR4>DDR3 BUT DDR4 WILL BE EXPENSIVE ,