Reversing the orientation of the processors in a dual-processor arrangement enables the overall length of the host bus to be reduced. In addition, less board layers may be required because the number of data and address/control bus crossovers is also reduced. Furthermore, the heat-dissipation surfaces of the processors may be aligned to face one another thereby forming a channel. This makes it more efficient to cool the processors because heat may be drawn away from each processor with a common fluid stream that can be propelled through the channel with a single fluid propeller.