An electrical connector (100) for electrically connecting with a chip module and a printed circuit board comprises a plurality of insulative housings (1), a plurality of contacts received in the insulative housing, and a frame (2) defining an accommodating space (26) to accommodate the insulative housings. The frame defines continuous lateral walls (23) and a plurality of enhancing ribs (24) extending from the lateral walls into the accommodating space. A plurality of first rivet sections (231) are disposed on at least one of the lateral walls of the frame and the insulative housings and a plurality of first mounting holes (16) are defined in at least one of the insulative housings and the lateral walls of the frame to receive the first rivet sections. A plurality of second rivet sections (243) are disposed on at least one of the enhancing ribs of the frame and the insulative housings and a plurality of second mounting holes (17) are defined in at least one of the insulative housings and the enhancing ribs to receive the rivet sections.