![]() The position of the notch on DDR4 memory modules is also different from DDR3 modules. DDR3's 1mm) accommodates more signal layers. They are also different in height and thickness - the increased height of DDR4 modules (31.25mm instead of DDR3's 30.35mm) makes signal routing easier, and the increased thickness (1.2mm vs. ![]() ![]() Both DDR3 and DDR4 DIMMs are 5¼ inch (133.35 mm) in length but the pins in DDR4 are spaced closer (0.85mm) than DDR3 (1mm). Spot the difference: schematic of the physical design of DDR2, DDR3 and DDR4 DIMMs.ĭDR4 is not backward compatible with DDR3 motherboards because the physical design of modules (DIMMs) for DDR4 and DDR3 are different.ĭDR3 modules use 240 pins and DDR4 DIMMs use 288 pins. ![]()
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