Idle numbers were recorded after leaving the system resting in the desktop for 15 minutes. Load numbers were achieved by running Crysis Warhead and measuring the drain at the wall. External devices such as the monitor are not included in the end result.
While we have seen the GTS250 outperform the 5670 in many games we can see that the Sapphire HD5670 is a much more efficient solution with considerable savings under load. This could translate to a reasonable saving over the course of a years intensive gaming.