fazz on 16 September 2007
Power usage could be an indicator, but isn't an absolute one.
For example, a Radeon X1800XT uses more power than a GeForce 7900GTX... but the GeForce is more powerful by a not-so-small amount.
It all depends on architectures. Some architectures require a high clock to stay on a competitive level. A high clock means high power usage.
