Scythe Musashi Dual Fan GPU Cooler [Postcript Added]

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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 ways, including:

  • 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.

Test Platform

Measurement and Analysis Tools

  • CPUBurn processor stress software.
  • FurMark stability test to stress the GPU.
  • GPU-Z to monitor GPU temperatures.
  • SpeedFan to monitor CPU temperature.
  • A custom-built variable fan speed controller to power the system fan
  • PC-based spectrum analyzer: SpectraPlus with ACO Pacific mic and M-Audio digital audio interfaces.
  • 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 degree angle.

Ambient conditions during testing were 23°C and 11 dBA.

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