You also have to take into consideration that graphics in a console has been optimized to run on whatever graphic card is integrated into the console. The Radeon HD 6570 is one of many different video cards and games designed for PCs are not optimized to run on a single specific graphic card.
Also, console games use smaller / compress textures compared to PC games so sometimes when you read reviews comparing XBox 360 games and PC games side by side you may see a comment about XBox 360 games looking a little "muddy" compared to PC games. The same can be said about PS3 games.
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