An electrical connector comprises an insulative block, a plurality of contacts received in the insulative block. The contacts each include a retaining portion retaining in the insulative block, a contacting portion extending forwardly from the retaining portion and a soldering portion. The contacts include a plurality of differential signal contacts and a plurality of grounding contacts. The soldering portion of differential signal contacts arranged to a plurality of rows and the soldering portion of grounding contacts arranged to a plurality of another rows which parallel to the row of the differential contacts. The row of the differential contacts and the row of the grounding contacts are spaced from each other.