This is a PC that was become a Hackintosh. If you're not knowledgeable about that this is, you can take a look at this link right here:.
http://en.wikipedia.org/wiki/OSx86.
Basically you get the exact same power (or better) than current Apple Desktop Models at half the cost. Upgrading parts is a lot simpler too.
Here are the specs:.
Intel Core i7 3.38 Ghz Quad Core.
6GB 1079 MHz DDR3 Memory.
GeForce 9500 GT 1024 MB (dual monitor capability).
Mountain Lion OSX 10.8.2 Installed.
1TB 7200 RPM Hard Drive.
This sale includes:.
3 Speaker System (with Subwoofer).
Wireless Internet Adapter.
Web cam.
2 - 19" LCD Flat Panel Monitors.
Apple Magic Mouse.
Apple Wireless Keyboard.