Temperatures & Acoustics / Power Consumption
For all temperature testing, the cards were placed on an open test bench with a single 120mm 1200RPM fan placed ~8” away from the heatsink. The ambient temperature was kept at a constant 22°C (+/- 0.5°C). If the ambient temperatures rose above 23°C at any time throughout the test, all benchmarking was stopped..
For Idle tests, we let the system idle at the Windows 7 desktop for 15 minutes and recorded the peak temperature.
What you see below are the baseline idle dB(A) results attained for a relatively quiet open-case system (specs are in the Methodology section) sans GPU along with the attained results for each individual card in idle and load scenarios. The meter we use has been calibrated and is placed at seated ear-level exactly 12” away from the GPU’s fan. For the load scenarios, a loop of Unigine Valley is used in order to generate a constant load on the GPU(s) over the course of 15 minutes.
One of the major benefits of TITAN over dual card solutions is its acoustical profile. While the GTX 680 SLI and GTX 670 SLI remain relatively quiet, the TITAN will never be heard over the sound of case fans. On the other hand, AMD’s cards are horribly loud with the GHz Editions putting out so much noise that you’ll likely need to wear headphones to retain a shred of sanity.
System Power Consumption
For this test we hooked up our power supply to a UPM power meter that will log the power consumption of the whole system twice every second. In order to stress the GPU as much as possible we used 15 minutes of Unigine Valley running on a loop while letting the card sit at a stable Windows desktop for 15 minutes to determine the peak idle power consumption.
Please note that after extensive testing, we have found that simply plugging in a power meter to a wall outlet or UPS will NOT give you accurate power consumption numbers due to slight changes in the input voltage. Thus we use a Tripp-Lite 1800W line conditioner between the 120V outlet and the power meter.
Much like its acoustical profile, the HD 7970 GHz Edition’s power consumption is simply out of control when compared against the other dual card configurations in this test. Although it still consumes a significant amount of power, NVIDIA’s GTX TITAN is the most frugal of this bunch by a long shot.
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