Bigbruin.com posted a review on the Sapphire Vapor-X Radeon HD4850 512MB Graphics Card

The biggest selling point of the Sapphire Vapor-X Radeon HD4850 512MB graphics card may be that it runs cool, quiet, and it is relatively energy efficient. Sapphire has made a few electrical tweaks, as well as developing a new cooler, that give you all the performance of a Radeon HD4850 without as much heat, noise, or electricity consumption.

Sapphire Vapor-X Radeon HD4850 512MB Graphics Card Review