We performed our power consumption measurements using an Extech Power Analyzer 380803. This device is connected before the PSU and measures the power draw of the entire system (without the monitor), including the power loss that occurs in the PSU itself. In the idle mode we start the system up and wait until it stops accessing the hard disk. Then we use LinX to load the CPU. For a more illustrative picture there are graphs that show how the computer’s power consumption grows up depending on the number of active execution threads in LinX (both at the default and overclocked system settings). The mainboards are sorted in alphabetical order on the diagrams.
We often point out that on many mainboards certain power-saving technologies are disabled by default. This time we decided to illustrate our discontent with this issue with numbers. We measured the power consumption of test systems in idle mode with default settings and then with all power-saving technologies manually enabled.
Biostar mainboards are usually quite economical, but this time we didn’t notice any significant differences from the other testing participants. By default the mainboard has almost all power-saving technologies up and running including the company’s own technology that dynamically changes the number of active phases in the processor voltage regulator circuitry depending on the operational load. Only C1E parameter was disabled for some reason. Despite our expectations, enabling it helped significantly lower the system power consumption.
As for the power consumption under heavy load, Biostar TA990FXE did just like all other testing participants in nominal mode. The tests in overclocked mode were not performed this time for the reasons explained above.