A blade computer system comprises side-by-side computer blades (44, 144), a connectivity module (50, 150, 350) extending across and connected to each of the plurality of side-by-side computer blades (44, 144) along the ends of the computer blades (44, 144) and at least one first power supply-fan unit (46, 146) extending perpendicular to the first axis and directly connected to each of the first plurality of side-by-side computer blades (44, 144) along ends of the plurality of side-by-side computer blades (44, 144) such that the at least one power supply-fan unit (46, 146) draws air across the first plurality of side-by-side computer blades (44, 144) and into the first connectivity module (50, 150, 350).