Here's temps versus heat of some of the top coolers. Megahalems is 2c warmer at 175w and 3.7c warmer than best at 345w.
Cooler Model . . . . . Fan . . . . . . . CFM . . . 345.1W 289.9W 232.1W 175.4W 117.1W dBA
Akasa Medusa . . . . FN059,/FN073 84/74 . . 26.7 . . 22.5 . . 18.7 . . 13.7 . . 10.1 . . 48.1
Silver Arrow SB-E. . TY-140TY-150 84/74 . . 26.9 . . 22.8 . . 18.7 . . 14.1 . . 9.5. . . 37.4
Noctua NH-U14S . . 1x NF-A15 . . . 1x 82.5 . 27.0 . . 22.9 . . 19.4 . . 14.9 . . 10.6 . . 35.8
PH-TC14PE Black . . 2x PH-F140. . . 2x 88.6 . 27.4 . . 23.5 . . 19.2 . . 14.1 . . 9.9. . . 41.3
Dark Rock Pro 2 . . T12025/T13525. 68/57 . . 28.2 . . 25.9 . . 20.2 . . 16.4 . . 11.2 . . 38.2
Megahalems . . . . . 2x FN059 . . . . 2x 83.6 . 30.4 . . 25.8 . . 23.4 . . 16.0 . . 11.5 . . 46.5
Noctua NH-D14 . . . 2x NF-P14 . . . 2x 64.9 . 30.6 . . 26.2 . . 21.3 . . 16.3 . . 11.8 . . 38.2
http://www.thelab.gr/heatsinks-coolers-watercooling-reviews/cpu-cooler-review-database-89014.html