People build HTPC?s out of spare parts all the time. The problem is that you shouldn?t be using spare parts ? a high-end HTPC needs much more power than that. We?re putting a 7800GTX in our HTPC, and showing off the design issues behind building a high-end HTPC with an off-the-air HD tuner. Even if you?re not planning to build an HTPC, this is an important article to read to learn about PC video technology.

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