2 ms·
Ohm's Law says 5.2V @ 770A is only 4.004kW. With one of these on each of the three phases, that's a total of 12,012kW. So where did the rest of the power go,
by anonymousiam 6y ago
Ohm's Law says 5.2V @ 770A is only 4.004kW. With one of these on each of the three phases, that's a total of 12,012kW.
So where did the rest of the power go, into cooling? Perhaps it was a linear power supply instead of a switcher? That would make for lots of inefficiency.
- kens 6y agoThe Cray-1 has 36 power supplies: 20 that supply -5.2 volts, and 16 that supply -2.0 volts. (The weird negative voltages are for ECL, the fast logic family used in the Cray.) The bench around the Cray holds the power supplies. Interestingly, the power supplies themselves are unregulated; regulation is done by the motor-generator unit.