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http://www.tweakhardware.com/ Includes detailed, easy to follow how-to guides about tweaking and modification. Guides cover a variety of hardware topics.
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http://www.hardocp.com Offers up the latest news and computer performance tips to help you achieve maximum performace from your PC.
Guru3D (Popularity: )
http://www.guru3d.com Get the latest news and performance tweaks for PC Video Cards, as well as the other PC components that support ...