Alienware Alpha Intel-Powered SFF Gaming PC: Consoles Beware
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The Alienware Alpha really shines when it comes to power consumption. The system used only 24.3 Watts at idle in our test, which is the lowest we've seen from a gaming PC in recent memory. It fared well under load, too, pulling a mere 106 Watts.

As for noise, the Alpha is a quiet little PC. It's nearly silent during ordinary use. Get a game going, and the Alpha purrs a bit, but even that is too quiet to bother anyone. I barely noticed the noise when it sat on my desk and I couldn't hear it at all when the system sat on my TV stand. Noise isn't going to be an issue with the Alpha.