System idle power on the integrated graphics systems is almost identical if you compare Intel’s current Core i3/i5 with the new Sandy Bridge generation. The difference we measured at the plug was only 1 W. But keep in mind that both of the new Core i5 and i7 processors are based on four processing cores, while the Core i5-661 and Core i3-530 only offer two physical cores. We find it significant that the AMD systems require 50% more idle power in case of the Phenom II X4 and most than 90% higher idle power on the Phenom II X6. Remember: this is without being faster in most of the workloads.
You could argue that AMD power consumption can be decreased by using lower-power processors. However, this would also be the case on the Intel side. After all, there
are S- and T-class Sandy Bridge-based parts. Overall, there is no arguing about this massive difference in idle power consumption.