When you are putting together your server racks, you need to be very conscious of the amount of power that the finished system is going to draw. If you find that the number of amps that all of the combined units are going to require to function at maximum capacity are too high for a standard power strip, you may find that you have to install a PDU in its place.
A PDU Can Handle Heavier Current Loads
One problem that you can end up facing with a simple power strip that cannot handle the loads is that this lack of power can prevent your servers from getting the power they need to run at full capacity. When this happens you could be faced with servers that either slow down to a crawl or overheat, which could lead to a fire. With a PDU you can choose the one that is most suited to handling the maximum load your servers are likely to place on it and leave room to spare, so that you never have to worry about these risks.