Dell Heat Sink for R740/R740XD/R640, 125W or lower CPU (low profile, low cost) /412-AALZ
Dell Heat Sink for 2nd CPU, R440, with Bracket (01CW2J)
Dell Heat Sink High Performance for R740/R740XD, with Bracket (0TRJT7)
Dell Kit Heat Sink for 2nd CPU, R440, APAC, Heatsink/Fan (412-AANW)
Dell Kit Heat Sink for 2nd CPU, R640| Heatsink/Fan