Modders-Inc.com posted a review on the Sapphire HD4870 512MB video card
The use of the GDDR5 memory, increased bandwidth, DirectX 10.1 and a 55nm GPU it sounds like it should place this card in the higher end of the "pay for what you get" scale, but it can be had for about $285 USDSapphire HD4870 512MB Review
