A card edge connector (100) includes an insulative housing (1) having a pair of side walls (16) with a central slot (12) formed therebetween and a number of upper cavities (13) and lower cavities (14), the central slot defining a central line (125) along a middle portion thereof, the upper cavities and the lower cavities being located on opposite sides of the central line; a number of contacts each including a contacting portion (211, 221, 231, 241) extending into the central slot, a soldering portion (213, 223, 233, 243) extending out of the housing and a fixing portion (212, 222, 232, 242) interconnecting the contacting portion and the soldering portion, said contacts having upper contacts and lower contacts received in the upper cavities and the lower cavities respectively, the lower contacts comprising a first row contacts (21) and a second row contacts (22), the fixing portions (212) of the first row contacts and the fixing portions (222) of the second row contacts being located on opposite sides of the central line respectively.