GMC are a Korean manufacturer of PC cases and they are continuously trying to design innovative and functional products for enthusiasts who would like to have something a little different. Today we will take a look at one of their latest creations, the R-3 'Corona'. The R-3 is a tower case designed to fit a standard ATX system but with the minimum possible dimensions, making it considerably smaller than any standard ATX case out there. Of course such a design has downsides as well as advantages which we will examine in this review.