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can a Mac mini run unreal tournament 2004? If so is it on high settings?

An iPhone 6S has the graphical capability to run UT2004 on High :)

So yes, you'll be fine. Just make sure you're running natively on Windows I suppose, any sort of ports/emulations/VMs in OS X will almost definitely impact performance ... unless there's a native Mac version? I only played it on PC back in '05.
 
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