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12V to 7V Adapter for Case FansTo Reduce Case Fan NoiseAlmost all case fans run on the 12V DC supplied through a power supply. One way to reduce fan noise is to supply a lower voltage to the fan. All ATX power supplies provide both 12V and 5V DC outputs. A case fan could run on a 5V voltage, but the 58.3% voltage reduction would significantly reduce the cooling power of the case fan. An alternative is to use the 12V as the positive and the 5V as the negative (ground), using the voltage difference as 7V. With 7V, the voltage is dropped only 41.7% from 12V, but it is 40% higher than 5V allowing enough cooling while effectively reducing fan noise. OEM bulk pack. We tested this voltage arrangement on several case fans. The result is amazing. The fans run much quieter with the lowered voltage. Specs: 12V is supplied on the Yellow wires. 5V is supplied through Red wires. The black wires are ground. Two pass-thru connectors included at each end. One end is male to be connected to the power supply. The other end is female to be connected to the case fan. The actual length of the cables between the connectors may vary. Do not depend on the length for extension purposes. Notes: (1) Many case fans come with 3-pin molex connectors. In that case, please order a 3-pin to 4-pin adapter to use this device to supply 7V DC voltage to your case fan. (2) If you need to supply 7V to more than one case fan, add IDE Y-cables to your order. Each Y-cable would allow you to add one additional case fan. Regular Y-cables would work. You do not need special Y cables to extend the 7V output. (3) Yes, you can use 7V DC voltage on already quiet case fans such as Panaflo from Panasonic and Silencer from PC Power. However, it is not recommended due to significantly lowered air flow. (4) If your case fan has a temperature sensor, you cannot take advantage of the feature unless a 3-way splitter is used together with this product. (5) Lowering the voltage will reduce the air flow. We recommend using this product together with the best CPU heat sink/fan (HSF) on the market. If your system has over-heating problems, please do not use this product. (6) You can also use 7V DC voltage to CPU fans, however, we do not recommend that since it reduces the cooling power of the CPU fan. (ud1103mp) Related Items: | Power Cables & Adapters | Quiet PC | Case Fans | Gallery | | Case Badges | Cable Management | Glow Stickers | 3D Objects | Mod Tools | Hardware | | Screws & Nuts | Sensors | Water Cooling | Mod Guides | Overclocking | | ||||||
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