Fans may be either 5 Volt DC or 12 Volt DC fans. The Corsair SP series is one of those, but there aren't many so the choice is made for you. Not all fans or motherboards control or power the fan assemblies the same way. Most fan models are one or the other, but there are a few that are identical other than a DC or PWM motor (and likely some deliberate range differences). Also, when using the fans with AIO coolers, nearly all units that control fan speed from the device itself will need a PWM fan. Some less expensive boards may still use PWM on CPU fan and standard 3 pin on other headers in cost saving measure. Most motherboard headers are dual, but this is not guaranteed. The most important thing to consider is your control source. You can sometimes see this in the operational voltage range in the specifications. I have this thing wired up to a molex and have tucked the unused signal wires into the shield that came with the cable. Already fried a controller and it takes almost a full week to get another one. Just to make it more confusing, some PWM fans can be run in DC mode and work just fine. I also need the pinout for the 4 pin header on the north (opposite the 5-pin fan connectors) side. DC voltage controlled fans are normally very linear in their response and you can roughly guess and be right. Once you figure out the behavior, it is easy to adjust your fan curve for the desired effect. On high speed fans, you probably want PWM control.Ī less common issue for some PWM fans is they may not react in the linear path expected on certain fan controllers. A 1200 minimum on a 2000 rpm 140mm fan would be a lot to endure at the desktop. In high speed fans with max speeds above 1500, this can be far more meaningful. On a 1000 rpm fan, this likely makes little difference. PWM is usually less, sometimes as low as 20-25%. Typically a DC fan has a 60% minimum run speed. However, there are a few things a normal user may want to consider. Inspecting, debugging, reworking, and assembling PCBs has never been simpler or more accurate. You can also use InspectARto interactively assess and improve your PCB design process using augmented reality. The same blade moves the same amount of air in the same environment at the same speed. Allegro PCB designerwill come in handy when designing a 4-pin PWM fan controller. People sometimes have strong opinions on this topic, but it is mostly based on preference or familiarity than actual performance differences.
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