PC Perspective posted a review on the AMD Radeon HD 6670 and HD 6570 Graphics Card
A quote from the article:
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This week AMD has announced a slew of new options to address this market including the Radeon HD 6670, HD 6570 and even the HD 6450. Topping out at $99, the Radeon HD 6670 offers good performance, strong HTPC features and low power consumption. NVIDIA's competition is still reasonable though as we compare how the now price-dropped GeForce GTS 450 sits into the stack.
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