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Key difference between DDR4 and DDR3 RAM
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ASRock's Combo Motherboards Support DDR4 And DDR3, Making Skylake Upgrade Easier | Tom's Hardware
Helperboard A133 Arm with Mini Pcie Motherboard Support 1g/2g/4GB DDR3 DDR4 RAM with So-DIMM Socket Mini Itx Motherboards - China Control Board, Development Board | Made-in-China.com