What is fly-by -  DDR3 DRAM modules use a new fly-by topology for the commands, addresses, control signals, and clocks to improve the signaling and sustain memory signal integrity at high speeds. A fly-by topology daisy chains the address and control lines through a single path across each DRAM similar to how an FBDIMM module operates. This is unlike DDR2 memory, which splits the signal path between all DRAM chips through T-Branching.

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