The outer width of the case isn't enough to determine whether a given cpu fan will fit. Normally, I'd say check the manufacturer site for maximum cpu cooler height, but I don't find a manufacturer site for CiT. The Rosewill Challenger has a rear 120mm fan mount, which usually means there is enough inside width for a 212 EVO, but the CiT Mars case from what I can find only has mounting for an 80mm or 92mm rear fan, so there's a good chance the 212 EVO won't fit.