Corsair Carbide 400Q is the junior sibling of the Carbide 600C we saw quite recently. The Q suffix stands for Quiet and C for Clear (i.e. it has a windowed panel) and both Carbide 400 and 600 come in Q and C variants. Unboxing the 400Q reveals a case that looks understated. It lacks the visual wow factor of the enormous window we saw in the 600C and would presumably get with the 400C. It makes life easier if we put Carbide 600 to one side as that design uses an unconventional upside-down layout and is also very wide. By contrast the Carbide 400 is a slimline ATX tower that is only 215mm wide. Pulling off the side panels reveals the noise deadening material that has been added to qualify for the Quiet name tag and it should be a quick job to remove the power supply cover and front panel and lay the case bare.