BTW, the best solution for the extra 1 hp space that odd-count modules cause is to use at least one of those spaces to put in a Konstant Labs PWRchekr. It really IS the most useful 1 hp module of all time if you have a power supply with no DC rail indicators. The PWRchekr tracks the DC rail voltages and gives you visual feedback if there's a malfunction...and all for about $25, which puts it into the STOOPID-CHEAP zone!