Copyright
©
2013
congatec
AG
TU87m10
15/108
2.5
Power Consumption
The power consumption values listed in this document were measured under a controlled environment. The hardware used for testing includes
a conga-TC87 module, conga-TEVAL carrier board, hdmi-equipped LCD monitor, SATA SSD drive, and USB keyboard/mouse. The SATA drive
was powered externally by an ATX power supply so that it does not influence the power consumption value that is measured for the module.
To ensure that only the power consumption of the CPU module is measured, the conga-TEVAL power consumption was determined before the
measurement and subtracted from the overall power consumption value measured.
The USB keyboard/mouse were detached once the module was configured within the OS. All recorded values were averaged over a 30
second time period. Cooling of the module was done by the module specific heatspreader and a fan cooled heatsink to measure the power
consumption under normal thermal conditions.
Each module was measured while running Windows 7 Professional 64Bit, Hyper Threading enabled, Speed Step enabled, CPU Turbo Mode
enabled and Power Plan set to “Power Saver”. This setting ensures that Core™ processors run in LFM (lowest frequency mode) with minimal
core voltage during desktop idle. Each module was tested while using two 2GB memory modules. Using different sizes of RAM, as well as one
or two memory modules, will cause slight variances in the measured results.
To measure the worst case power consumption the cooling solution was removed and the CPU core temperature was allowed to run up to
between 90° and 95°C while running 100% workload with the Power Plan set to “Balanced”. The peak current value was then recorded. This
value should be taken into consideration when designing the system’s power supply to ensure that the power supply is sufficient during worst
case scenarios.
Power consumption values were recorded during the following stages:
Windows 7 (64 bit)
• Desktop Idle (power plan = Power Saver)
• 100% CPU workload (see note below, power plan = Power Saver)
•
100% CPU workload at approximately 100°C peak power consumption (power plan = Balanced)
• Suspend to RAM. Supply power for S3 mode is 5V.
Note
A software tool was used to stress the CPU to Max Turbo Frequency.
