I want to connect a 12v 3 / 4 pin case fan with a usb cord. I know that it's possible with lower voltage.
Here's an adapter for 4-pin to usb:
amazon.com/StarTech-Motherboard-4-Pin-Header-USBMBADAPT/dp/B000IV6S9S/ref=sr_1_23?s=electronics&ie=UTF8&qid=1361905489&sr=1-2...
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