The figures quoted for the cluster are about 25 times higher than those quoted for a single machine, so I would guess the cluster consists of 25 machines. 20 k

The figures quoted for the cluster are about 25 times higher than those quoted for a single machine, so I would guess the cluster consists of 25 machines. 20 kW, or 166 amperes at 120 volts, per machine seems a bit high to me.