TheTechLounge published a Diamond HD 4870 512MB review.
Quote from the review: "The 4870 is an excellent card, but for now, all the models are functionally identical, and there are yet to be factory-overclocked cards, let alone custom-cooled models. Variation ranges from changing the sticker to adding spiffy adapters. If you buy Diamond, you're not buying a different card, you're buying better service, only they're not charging extra."
Read the full review on TheTechLounge.
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