Abstract: A heat sink fastener includes an elongated clamping plate attached to a heat sink and having two clamping arms at two opposite ends respectively hooked in respective hook holes on a CPU module to secure the heat sink to the CPU module, and a holding down plate coupled to the clamping plate to hold down the clamping arms, the holding down plate having a longitudinal locating hole coupled to the clamping arms of the clamping plate to hold down the clamping arms in the respective hook hole on the CPU module, and a finger strip for pulling by hand to disengage the holding down plate from the clamping arms of the clamping plate.

Abstract: A CPU heat sink fastener includes a retainer member having two V-shaped arms extended from a flat base thereof and respectively hooked in respective locating holes on a CPU module to hold down a heat sink on the CPU module, and a holding down member having a longitudinal slot forced into engagement with the V-shaped arms. The holding down member is pushed to a position below reinforcing ribs at the V-shaped arms to force the V-shaped arms inwards and to secure the retainer member in place.