Power And Temperature Benchmarks
While the stock Core i7 system is in the same league as the overclocked Core i5 machine, the overclocked Core i7 brings power usage to new heights. There is a definite trade-off here, and the Core i5 looks to be a better choice for efficiency.
The Core i7 system shows a definite benefit here, but keep in mind that the Core i5-750 is saddled with the stock cooler to keep the system under its budget.