Viewing page 4 of 8 pages. Previous 1 2 3 4 5 6 7 8 Next
Our test procedure is an in-system test, designed to determine whether the
cooler is adequate for use in a low-noise system. By adequately cooled,
we mean cooled well enough that no misbehavior related to thermal overload is
exhibited. Thermal misbehavior in a graphics card can show up in a variety of
- Sudden system shutdown or reboot without warning.
- Jaggies and other visual artifacts on the screen.
- Motion slowing and/or screen freezing.
Any of these misbehaviors are annoying at best and dangerous at worst
dangerous to the health and lifespan of the graphics card, and sometimes to
the system OS.
Measurement and Analysis Tools
processor stress software.
stability test to stress the GPU.
- GPU-Z to
monitor GPU temperatures.
to monitor CPU temperature.
- A custom-built variable fan speed controller to power the system
- PC-based spectrum analyzer:
SpectraPlus with ACO Pacific mic and M-Audio digital
- Anechoic chamber
with ambient level of 11 dBA or lower
A summary of how our video card/cooler test platform is put together can
be found here.
Our main test consists of FurMark stability test running in conjunction with
CPUBurn to stress both the graphics card and processor simultaneously. This
combination produces more CPU/GPU stress than a typical gaming session. As our
test system has very limited airflow, our results are not indicative of a real-world
situation, but rather a worse-case scenario. If the heatsink in question can
cool the card and its components adequately in this environment it means there
is some degree of thermal headroom when employed in a more conventional manner.
GPU temperatures are recorded using GPU-Z. On our HD 4870 test card, there are
three main on-die sensors, as well as three on the voltage regulators. We average
the results of each set of sensors.
The cooler is tested at various speeds to represent a good cross-section of
its airflow and noise performance. Noise is measured and recorded with the heatsink
installed in our test system with the side panel on. Our mic is positioned at
a distance of one meter from the center of the case's left side panel at a 45
Ambient conditions during testing were 23°C and 11 dBA.
|Help support this site, buy from one of our affiliate retailers!|