Is DDR4 RAM compatible in a DDR3 RAM slot?

No, DDR3 and DDR4 are not cross compatible The physical sockets are different among other things like input voltage, pin count, etc

DDR4 is a pretty hot discussion topic right now, and we became curious can you expect to see

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ddr3 slot The socket H2 supports dual-channel DDR3 memory with data rates up to 1600 MHz, Direct Media Interface running at 5 GTs, and PCI Express and