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Sunbeamtech Rheosmart 6 Fan Controller Review


Closer Look:

With everything unpacked, this is what you'll get when you buy the Rheosmart 6. Obviously, the Rheosmart 6 itself, along with four mounting screws and a small badge, both contained in small, plastic, zip bags, a manual, and six different cables. Those cables are, from right to left with a brief description:

  • 1x 4-pin PWM cable. This plugs into the motherboard at either the CPU or SYS_FAN header, and then to the controller. This is what gives the Rheosmart its 'Smart Cooling' feature. When plugged into the CPU_FAN header, the Rheosmart receives temperature data from the processor's temperature sensor and will adjust the fan speed according to that when in automatic mode. When connected to the SYS_FAN header, the fan speed will vary with the internal ambient temperature. This is a Y-cable with an additional 4-pin male connection for the processor's heatsink fan for when used with the CPU_FAN header.
  • 2x 3-pin Monitor cables. The main function of these two cables is to link up to two fans with additional motherboard fan headers to provide RPM monitoring. Additionally, the monitor portion of these Y-cables can be tucked away and they may be used simply as extension cables for 3-pin fans.
  • 2x 3-pin Extension cables. Very straightforward in name and use.
  • 2x 4-pin Molex to 3-pin adapter cables. These can be used to convert up to two fans with 4-pin Molex connectors to 3-pin fans.








The bottom of the Rheosmart is protected from any metal to trace contacts with a simple piece of black foam. Toward the front of the Rheosmart, the bottoms of the pots are visible.

These are the guts of the Rheosmart 6. There isn't much because there doesn't need to be, and the soldering is nice and clean. On the bottom are the six fan headers, 4-pin Molex power connector, and the 4-pin PWM connector.  A closer look shows that each of the six manually controllable fan headers has its own voltage regulator to vary fan speed.


A closer look at the front of the Rheosmart 6 to show off the dials and buttons. Hidden behind the mesh above each dial is an LED that switches between red and green. Red if the fan controller is varying the fan speed with temperature and green if the fans are under user control.

  1. Introduction & Closer Look
  2. Closer Look Continued
  3. Specifications & Features
  4. Installation
  5. Testing
  6. Conclusion
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