Hi Tech Legion posted a review on the Sapphire Radeon HD5870 and HD5750 Vapor-X Edition

Most people who are aware that heat can shorten the life of a computer component usually focus on the CPU and will purchase an aftermarket heatsink and fan combination to better cool the CPU. What many people forget to think about is their video card; most take it for granted that excessive heat can also shorten the life of a video card. Cooling a GPU is just as important as cooling a CPU and many times the stock heatsinks that come with many reference models do not cool as efficiently as desired and can tend to be very loud. Usually within a few weeks of the launch of a new series of video cards we will start to see manufacturers releasing video cards with their signature heatsinks. Sapphire is one of those manufacturers and their Vapor-X line has proven itself as an efficient and quiet cooling solution since its introduction in 2007 with the 3870 Atomic Edition video card. This was the first of Sapphires video cards to use Vapor- X technology. The Sapphire Radeon HD5870 and HD5750 are the next line of Sapphires video card to receive Vapor-X technology. The Sapphire HD5870 and HD5750 Vapor-X Edition line of video cards also have slightly higher clock speeds than the standard edition of 5000 series video cards in their class.

Sapphire Radeon HD5870 and HD5750 Vapor-X Edition Video Card Review