Not quite as small as it used to be. But it's silent.

The Noctua NH-P1 is the Kaiju of CPU cooling. The monster heat sink looks absolutely insane paired with this tiny Dell Optiplex 7040. The process was far from simple ("I had to modify the mounting bracket so it would fit the non standard cooling mounts. And obviously I also had to cut a hole in the top") but the end result is pure genius.

Source: reddit