A heatsink structure cools a first electronic chip and a second electronic chip that are positioned serially and in-line to one or more cooling fan, such that cooling air from the cooling fan(s) passes above the first electronic chip before passing above the second electronic chip. The heatsink structure includes a first heatsink and a second heatsink, which are identical to each other, and which fit adjacent to one another when a first heatsink is rotated 180 degrees relative to the second heatsink.