Tweaknews posted a review on the Sapphire Vapor-X HD4850 512MB Videocard

Sapphire did a good thing by bringing a feature rich HD4850 videocard on the market that won't break the bank, but isn't holding back any performance. The card is priced well, relatively fast, quiet and overclocks very well.

Sapphire Vapor-X HD4850 512MB Videocard Review