That's part of it AlphaC. I think it's more the heat pipe surface area, and number of fins and how well the fins and base block are attached to pipes. Heat transfers from block out the pipes to pipe surface to fins to air. More care is being take to make sure pipes and fins are getting good airflow in these new coolers.
Originally Posted by Art Vanelay
It might just be that the reviewers are terrible. There was one review I think on tweaktown where the H80i beat the h100i, which is obviously wrong.
Many reviews are far from accurate. I've only see a couple of unknown reviewers who give the cooler intake air temp.. which the the important temp, not the room ambient. H80 and H100 are very close in performance because H80 radiator is 38mm thick to H100 being 27mm thick and both run 2 fans so they are close in performance..