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To battle this people created elaborate switching devices to control when fans would come on and even control how fast they would spin. Fan switching is relatively easy however RPM control is not, for this you needed called a rheostat baybus. The rheostat would allow you to control the voltage going to each fan or in some cases completely turn them off.
Motherboard makers have been offering up similar solutions by offering software to control the onboard fan headers. Sadly these headers do have power limits so an external controller seems like a good match for powerful case fans.
Normal output 30 Watt per channel
4 fan adjustable function
Various knobs designed to control the brightness
Dimension: 150mm*43mm*80mm(5.25" Bay)
Max Power: 30W per channel
Control Channel: 4 Channels
Color Available: Black Aluminum anodized and Aluminum Silver
DC Input: + 12V(Standard 4- Pin Connector)
DC Output: 0V- 12V DC
LED Indicator: 4 *Blue LED
Fan Connectors: 4 pcs
Fan RPM Knobs: 4 pcs
For a copy of these specs please visit the Lamptron website