The GT3 Sport Case is a small form factor case created by the folks at 
GTR Tech Corporation. However, this isn't your every day small form 
factor (SFF) case. One of the big limits they have removed is the fact 
that you have to use a limited motherboard or a MicroATX board. They 
have opened up the motherboard tray to the standard 12” x 9.5” ATX 
motherboard size. So you now have the option of using full size 
components typically found in mid or full sized cases in a SFF case.
http://www.gideontech.com/content/articles/356/1