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Power Consumption

Besides the performance tests we were also interested in checking out how greatly the power consumption of a typical Socket FM1 platform will increase during overclocking. Of course, even though Llano processors are manufactured with 32 nm process, they can’t compete with Sandy Bridge processors in energy-efficiency. Their typical calculated TDP is either 100 W or 65 W. Mobile models with smaller power appetites work at much lower frequencies. However, the increase in power consumption during system overclocking will allow us to conclude whether Llano processors require high-end cooling to function properly.

The graphs below show the full power draw of the computer (without the monitor) measured after the power supply. It is the total power consumption of all the system components. The PSU's efficiency is not taken into account. The processors are loaded by running the 64-bit LinX 0.6.4 utility. We also used FurMark 1.9.1 to load the graphics cores. We enabled all the power-saving technologies for a correct measurement of the computer's power draw in idle mode.

I have to say that Cool’n’Quiet technology works on Gigabyte GA-A75-UD4H even when we manually adjust the processor clock multiplier and increase its core voltage. In idle mode the multiplier was lowered to x8 and the Vcore was dropped.

Well, we don’t need any tests to tell you that Llano is one hot fellow. When the processor frequency increases, it gets to the point that you can’t stay close to the test system, as the heat waves make you feel really uncomfortable.

The numbers indicate exactly the same thing. When we overclock our A8-3850 to 3.6 GHz one way or another, the overall Lynx platform power consumption under load increases by almost 1.5 times, and the entire platform may consume around 180 W. It is actually quite a lot considering that we do not have a discrete graphics card inside the system. Just for the sake of comparison let me tell you that a system built around Intel Core i5-2500K processor overclocked to 4.7 GHz with a discrete Radeon HD 6970 inside consumes just about the same amount of power during high CPU (not GPU) load. So, obviously, an overclocked Llano is not fit for an energy-efficient system at all.

 
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