One day, for a reason another, the desire or the need for changing case is felt. Dissatisfaction of the look, lacks place, heats too significant, the reasons do not miss. This change does not raise questions badly: a new case, it is also (often) a new food integrated not always of quality. Blow, it is interesting to choose a case and to acquire the food separately. The good tests of food do not miss but one often forgets the practical side of the thing: cooling, the number and the type of connectors, the length of the cables, etc. Doesn't this article aim only the food, but also centralizes ideas fished in forums to preserve a quiet PC?