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I did some graphics benchmarking (Mac mini quad core 2.6), and the mini's graphics don't blow one's socks off. For instance, with a 2540 x 1440 display the Unigine Heaven benchmarker (which is basically 26 different 3-D textured movement scenes from a game rendered back to back) got less than 7 frames per second (I hadn't shut down other applications, but nothing else was really happening on the Mac mini during the benchmarking). I think I got about double that with the display at 1920 x 1200 and everything shut down, but I don't remember for sure. At any rate, it was hurky-jerky.

I also ran Cinebench, NovaBencn, XBench, Geekbench, and Power Fractal. If any of these mean anything to you I could post results.
 
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