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.
In order to hit its high Boost clocks, the ACX SC needed to keep the GK110 core as cool as possible and it does just that. It actually manages to beat out Gigabyte’s well-regarded WindForce heatsink in this key metric.
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.
On paper, the GTX 780 ACX may seem louder than the Gigabyte WindForce OC but truth be told, it’s almost impossible for the human ear to distinguish one from the other. Remember, we’re talking about readings in the sub-50 decibel range which is as quiet as most fans get. With that in mind, these are some impressive results for EVGA’s first in-house designed heatsink.
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.
Despite its excellent temperature results, this card utilizes high clock speeds and is quite power hungry. It matches the requirements of a GTX TITAN which goes to show that when frequencies reach the upper registers, the GTX 780 lines up perfectly with NVIDIA’s flagship from a performance per watt standpoint.
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