For simplicity, I’m going to use one of these eBay PWM controllers I’ve had collecting dust for a while. There’s a lot of ways to get this done, and whether you’re using a voltage controlled oscillator, astable multivibrator 555 timer, an Arduino/microcontroller, or a fan PWM controller, you’re accomplishing the same thing. I’m seeing that some of the Mac fans can simply be fed the same input voltage to this pin and it works fine (the centrifugal fan from a Power Mac G5 worked fine like this), but most of the fans will not function if you simply put a DC voltage on the PWM pin.
These are PWM fans, which means they need a continuous sequence of pulses timed accordingly to how fast they should be spinning. These dual 3 blade fans are at the intake of the Power Mac G5 CPU(s). This is the PCI Fan (blows on GPU, center of tower.) This fan was out of a Mac Pro, 2009-2010. This fan was out of a Power Mac (G4?), and I’ve seen this connector and pinout on others. I’ll add more if I find more let me know if you need a specific fan figured out and I’ll add it. These connectors are from Power Macs and Mac Pros. VM/PWM, VCC/+, O/P, and GND/- are shown on both fans. If you remote the grey sticker on the back of the fan, you’ll see the same four wires on most of these fans no matter the connector. Ground is ground, VCC is +12V, O/P is Sense/Tacho, and VM or PWM is PWM. The Delta fans Mac used in the Mac Pro use the same pins essentially. Male Header: 47053-1000 Pinouts Motor Connections You can obtain those connectors and pins from Amazon and eBay pretty easy for a clean looking conversion.
#Mac pro power supply pinout Pc
The 4 wire Mac fans are about the same Delta brand fans as you’d see in a PC except the pin configuration is usually different. If the fan has more than 3 wires it is almost invariably going to be PWM type. The +12 is a constant and the pulse train frequency controls the speed. The 4 wire Mac fans that I’ve used have all been PWM. I’m not covering this in depth since I’m using these for a 3D printer project, but contact me if you’d like to have me break this down further.
Chances are the connector you need to use looks like one of the Molex 2, 3, or 4 pin connectors. You’ll have to acquire the connectors and pins which work with your motherboard.
#Mac pro power supply pinout mod
If you’re reusing these with your hackintosh or case mod build, you’re going to want to repin these fans to work with your motherboard. I couldn’t find a clear pinout for a few common Mac fan connectors, and I noticed a lot of people wiring them up to straight DC sources wondering why they didn’t work. They are are wonderful static pressure Delta brand fans. I’m going to make an air scrubber to filter ABS fumes (mostly styrene) with a couple fans from my stack of retired Mac Pros. Mac Pro and PowerMac Delta Fan Pinouts and PWM Wiring
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