I have to disagree. If you are using a newer socket Pentium chip with the heat spreader you might not need one. If you are using a socket 370 celeron or pentium 2/3 with no heat speader I would recommmend them. With the Durons or Athlons I usually don't use one but I know I should. But I would recommend one in any case since it does make it easier to mount the heatsink.