There should be no surprises about the power consumption of the Core i5-760. Its clock rate is similar to that of the Core i5-750 and it has an old core stepping. Its specified electric and thermal properties have not changed, either. However, we shouldn't forget that a year has passed since the release of early Lynnfield processors and their 45nm tech process has become far more optimized. As a result, the new CPU can work at a lower voltage even though this is not explicitly marked in its specs.
Our sample of the Core i5-760 is designed for a voltage of 1.125 volts, which should have a positive effect on its power consumption. The graphs below show the full power draw of the computer (without the monitor) measured after the power supply. It is the total of the power consumption of each of the system components. The PSU's efficiency is not taken into account. The CPUs are loaded by running the 64-bit LinX 0.6.3 utility. We enabled all the power-saving technologies for a correct measurement of the computer's power draw in idle mode: C1E, AMD Cool'n'Quiet and Enhanced Intel SpeedStep.
We might have expected the Core i5-760 to be more economical than its predecessor under load. We got our test sample of the Core i5-750 processor about a year ago and it works at a higher voltage of 1.225 volts. Quad-core Core i5 series processors are generally more economical in comparison with both the Phenom II X6 and Core i7 series. However, it is the 32nm dual-core Core i5 series and, rather surprisingly, the old Core 2 Quad series that are the most economical among $200 processors.
Improved manufacturing process may also improve a processor's overclockability. So, we tried to accelerate our Core i5-760. Since it does not belong to the overclocker-friendly K series, it could only be overclocked by increasing the base clock rate above the default 133 MHz.
We can remind you that Core i5 series Lynnfield processors can usually work at a clock rate of about 4.0 GHz after a small increase in their voltage.
The Core i5-760 carries this tradition on. We increased its voltage to 1.4 volts (which is perfectly safe as it is within the processor's specified voltage range) and overclocked our sample to 4.2 GHz.
The overclocked CPU passed every stability check, its maximum temperature never being higher than 89°C.
To get a notion of the performance of an overclocked quad-core Core i5, you can refer to our Phenom II X6 1055T review where we compared the two CPUs at default and overclocked frequencies.