Filling in the numbers
Ashlee -- sorry about any confusion we may have caused on our end.
To repeat the numbers:
We've done the engineering necessary to keep the power low. We started out with an engineering budget of about 15 per node (node chip + 2 DIMMs). The node chip aimed at 10W, the rest allocated to the DIMMs. Add to that the overhead for power supply and conversion losses and you get about 18W from the wall for each node.
The 648 processor systems that we've built are measuring about 1500W from the wall running real workloads. That says that the actual node power is below our engineering budget.
So, the math again is
SC648:
6 processors per node
27 nodes per module
4 modules in a system
4 modules * 27 nodes/module = 108 nodes
108 nodes * 18 W/node = 1944W
SC5832:
6 processors per node
27 nodes per module
36 modules in a system
36 modules * 27 nodes/module = 972 nodes
972 nodes * 18 W/node = 17496W