If FCPX is only using 2 cores in your testing...why not go with a 2 core mini with a faster CPU...would rendering (as you state) not benefit from the extra speed since only 2 cores are being used anyways? Other the other cores in a quad useful for other "stuff"? I know FCPX does other things in the backround (thumbnails, rolling, anti shake stuff...do these benefit from the other cores while rendering?
So...
If FCPX is only using 2 cores in your testing...why not go with a 2 core mini with a faster CPU...would rendering (as you state) not benefit from the extra speed since only 2 cores are being used anyways? Other the other cores in a quad useful for other "stuff"? I know FCPX does other things in the backround (thumbnails, rolling, anti shake stuff...do these benefit from the other cores while rendering?