An electrical connector for mating with the CPU unit, includes an insulative housing with a plurality of passageways extending therethrough in the vertical direction. A plurality of contacts are disposed within the corresponding passageways, respectively. Each contact includes opposite first retaining section and second retaining section with an upward resilient contacting section linked therebetween, and a soldering section extending downwardly from the first retaining section. The contacting section includes opposite first contacting part unitarily extending from the first retaining section, and second contacting part unitarily extending from the second retaining section. The CPU unit forms a plurality of metal-coated recesses in an underside to receive the contacting section of the corresponding contacts, respectively. The first retaining section is essentially immovable in the passageway while the second retaining section is essentially movable relative to the housing in response to mating with the CPU.