Push pin and graphics card with the push pin

A graphics card, comprising:

• a circuit board provided with a first installing hole thereon, wherein a ground pad is disposed at the periphery of the first installing hole on an upper surface of the circuit board;
• a heat sink disposed above the circuit board and provided with a second installing hole thereon;
• and
• a push pin, comprising:
• a rod;
• a head disposed at a first end of the rod and having a radial dimension larger than that of the rod;
• an expansion lock disposed at a second end of the rod which is opposite to the first end and having a radial dimension larger than that of the rod, wherein the expansion lock is configured to be elastically contractible when entering a component to be installed in an installing direction, and wherein the installing direction is a axial direction from the first end to the second end;
• and
• a first spring made of a conducting material and configured to be installable onto the rod from the second end in a direction opposite to the installing direction,
• wherein the expansion lock passes through the first installing hole and the second installing hole to install the heat sink to the circuit board, and wherein the first spring is disposed between the heat sink and the circuit board and electrically contacts with the heat sink and the ground pad.