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When the little Atom-powered Zotac and EEE boxes can't cut it, there's the Mac mini. I'm not a fan of OS X, but I've been hard pressed to find another box this small, this powerful, and this inexpensive.
I have two of these tiny powerhouses. The first is a 2011-vintage Mac mini server, hosting two 7200 RPM drives, and 16GB RAM, all in the service of running the Skype Studio. This thing can run and process multiple video streams, do dynamic rendering, and produce video, all almost silently, and taking up less space than a dinner plate.
I just bought a second one, a 2012-vintage Mac mini, that will run one of my content analysis servers, replacing the Zotac, which is just too slow. In fact, I'm moving the virtual machine running on the Zotac to the Mac mini, and no other configuration will be required, except that I get a heck of a speed bump.
These are great, all-around powerful boxes that fit anywhere. Of all Apple's products, this is the one I most hope they never discontinue.
What I like: Fast, small, and relatively inexpensive.
What I'd like to see: Less Apple attitude.
Find it here starting at about $599.