The Delta specs webpage for that fan is here:
http://www.delta-fan.com/Download/Spec/AFC0912DE-AF00.pdf
and it shows the fan has FOUR wires from it. I note that Newegg sells this with a 4-pin standard fan female connector on the end of it for computer use. However, it also has been sold, apparently, for use in specific Dell computers, and for that purpose Dell uses a 5-pin connector. So check what you really have. If it has 5 wires and pins, you'll need to look up how Dell does their fans. Or quite possibly the fan itself actually will have 4 wires with these colors, no matter what the end connector is.
The 4-wire model from Delta has these wires according to the spec sheet
Black Ground
Red +12 VDC supply
Blue Fan Speed Pulse Signal
Yellow PWM Signal
For connecting to that a standard female 4-hole fan connector, the connector pin assignments are
1 Ground (Black)
2 +12 VDC (Red)
3 Speed Signal (Blue)
4 PWM Signal (Yellow)
The female connector has two ridges on one side, and these fit just outside the plastic tongue sticking up from the mobo male header so they only fit together one way. Relative to the header pins and connector holes, those ridges are just outside Pins 1 and 3; Pin #4 is completely beyond the ridges. So that will help you identify which holes are which.
However, you still have a significant problem. As you say, this fan pulls higher power - it is rated at 2.5 A max current, whereas any common mobo fan header can supply at max 1.0 A. A 4-pin fan HUB can solve that because it draws fan power from the PSU directly and avoids the limit of the mobo header. HOWEVER, ALL such fan HUBS require a PWM signal from a mobo header to provide CONTROL of fan speed. Normally in 4-pin fan systems this signal is merely shared out to the fans on the Hub. Your problem is that you say the only fan header you have available on your mobo is 3-pin. That type does NOT provide the PWM signal required by the Hub. Without that control signal, the Hub cannot control the speed of this fan - it will always run full speed - and noisy!
If your mobo really has no 4-pin fan header for case ventilation fans, then there MIGHT be another way. Many recent mobos use 4-pin headers for the CPU_FAN header only, and actually do use PWM Mode to control that fan. Hence that header is a source of a PWM signal that can be used for your purpose. The way that is done is that you install the Hub. Then you disconnect your actual CPU cooling fan from the CPU_FAN header and plug the Hub's fan leads into that header. Then you MUST connect the actual CPU cooler to the Hub's Port #1, which is the only one that will sends its fan's speed signal back to the mobo header. It is IMPORTANT that the CPU_FAN header receive specifically the speed signal from the real CPU chip cooler, and not from another fan. Then you plug any case vent fans into other Hub ports. NOTE that, for this to work, your 4-pin CPU_FAN header must actually be using PWM Mode for control so that it supplies the PWM signal the Hub needs. ALSO, the Hub MUST be rated so that it can supply at least 2.5 A (30!) power to ANY of its ports so you can use your fan with it.
One other note. IF your actual CPU cooler fan is 3-pin also, then there's a slightly different way to do this, so let us know if that is a factor in your case.
Doing things this way has a minor drawback. It puts control of the case cooling fans under the direction of the temperature sensor built into the CPU chip, rather than by the sensor built into the mobo. But since there is a pretty good correlation between mobo workload (and heat generation) and CPU workload (and internal temperature), this is quite acceptable.
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