nukemaster
Titan
Turb0Yoda :
tiny voices :
You can hook it up to anything really. As long as it supplies power at very low amperage.
huh.
Most computer fans will run from 5 volts upto 12. Some will not start at 5. They run slower, but do in fact run. I has been the basis of computer fan speed control for years(voltage control).
New PWM is now preferred by many users(and I would guess board makers as it should be more easy to implement.).
As long as the power source has the required current and starting voltage for a fan it will run, just not at full speed. I used to run some fans off a 10 volt external power supply.