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1. A non-bottom block heat sink, comprising at least one radiation module and a plurality of heat pipes fastened to said at least one radiation module, wherein:
each said radiation fin module comprises a plurality of radiation fins arranged in a stack, each said radiation fin comprising a plurality of locating notches located on a bottom peripheral edge thereof and a supporting rib disposed between each two adjacent ones of said locating notches, wherein the supporting rib is at a predetermined distance above the elevation of the bottom peripheral edge; each said heat pipes comprises opposing heat receiving end and heat discharging end, the heat receiving ends of said heat pipes being press-fitted into said locating notches of said radiation fins and engaged with said supporting ribs, and the heat receiving ends of said heat pipes each having a flattened bottom side with a portion extending under the adjacent supporting ribs and peripherally abutted against one another such that the flattened bottom sides of said heat pipes are flush with the bottom peripheral edge of each said radiation fin and form a substantially flat and continuous surface; and each said radiation fin further comprises at least one stop rib protruding from an inside wall of each said locating notch and denting the outer wall, but not an inner wall of the respective heat pipe.
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