AMD announced the new mainstream video card series HD 4600 today. Hexus has published a review of the Sapphire HD 4670.
Quote from the review: "ATI fits in practically more of everything with this card: more shading, texturing, and antialiasing performance. Harnessed together, the underlying technologies for Radeon HD 4670 GDDR3 make it the fastest graphics card in its pricing sector, and the 2D multimedia feature-set isn't bad. To put the rendering power of the card in to some kind of perspective, it has a higher GFLOPs throughput (math ability) than the R600 - Radeon HD 2900 XT - a GPU launched less than 18 months ago and, at the time, ATI's supposed saviour at the high-end of the market."
Read the full review on Hexus.