AppleInsider posted a review on Apple's aluminum Mac mini and Mac mini Server

The redesigned Mac mini continues to hold down the low end of both Apple's desktop offerings and server products, shipping in both a standard version equipped with an optical drive and one 320GB hard disk, or alternatively a server model that drops the optical drive and its slot to make way for two 500GB hard disks.

Apple markets the Mac mini as being a convenient, compact replacement for an existing PC. It sits a step or two behind the mainstream iMac all-in-one system, and is not even close to the professional market Apple targets with the Mac Pro. In its server configuration, the Mac mini is similarly a long ways from the high end Xserve product line.

In terms of performance, the standard Mac mini is built with the same general architecture as the entry level 2010 MacBooks: a 2.4 GHz "P8600" Intel Core 2 Duo processor paired with NVIDIA's GeForce 320M graphics chip. The previous Mac mini paired a Core 2 Duo CPU with NVIDIA's GeForce 9400M, just like last year's MacBooks and the current low end iMac.

  Apple's aluminum Mac mini and Mac mini Server (2010) Review