To make sure that you get a complete picture we also measured the power consumption of our test system (without the monitor) built around the new AMD Athlon X2 7750 processor. We decided to compare these results against the power consumption of other platforms with similar performance but built with CPUs on different microarchitectures. These processors will be AMD Athlon X2 6000 and Intel Pentium DC E5300.
The systems were configured in exactly the same way as during our performance tests. Enhanced Intel SpeedStep and Cool’n’Quiet 2.0 power-saving technologies were activated. The CPUs were loaded using Prime95 25.8 utility.
The actual results correlate perfectly with the theoretical data. The previous generation Athlon X2 6000 processor on Brisbane core that features 65W TDP, seems to be much more power-efficient than its successor, AMD Athlon X2 7750 with 95W TDP. It means that the “performance per watt” coefficient is not among the strengths of the today’s newcomer. In this respect, the absolute leader will be Intel Pentium DC E5300: a platform based on this CPU consumes less power under load than an AMD Athlon X2 7750 based system requires in idle mode. Therefore, if you care about your electrical bill or need to build a quiet system, dual-core AMD processors on Stars (K10) microarchitecture may not be your choice.