A cable assembly comprises a housing; a PCB received into the housing and defining a front mating portion and a rear terminating portion. The rear terminating portion defines a plurality of pairs of signal conductive pads and grounding conductive pads. At least one grounding conductive located at one lateral side of each pair of signal conductive pads. And a cable has at least one first set of first wires and a plurality of sets of second wires. Each set of first wire has two grounding conductors and a pair of differential signal conductors respectively electrically connected to a pair of signal conductive pads and two grounding pads. Each set of second wire has a grounding conductor and a pair of differential signal conductors respectively electrically connected to a pair of signal conductive pads and a grounding pad.