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Fan amps and watts

post #1 of 23
Thread Starter 
My motherboard fan headers support fans up to 0.74A or 8.88W. I want to purchase a 12 VDC fan that's operation voltage is 6.0 to 12.8 VDC. The fan has a rated current of 0.70A or 8.40W. Is there any chance that the fan could run at the maximum 12.8 VDC or 8.96W, exceeding my motherboard fan headers' maximum rated current and damaging the fan or motherboard?
post #2 of 23
It'll run at a maximum of 12v because that's what the header supplies. There's normally a max per header and also a max of all the used headers combined - be sure not to exceed that either.
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post #3 of 23
No it the motherboard cannot output 12.8 volts.

But in all reality that .8 volts will only give you another hundred RPM at the most.
     
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post #4 of 23
Thread Starter 
Quote:
Originally Posted by Darren9 View Post

It'll run at a maximum of 12v because that's what the header supplies. There's normally a max per header and also a max of all the used headers combined - be sure not to exceed that either.

Then why does the manufacturer state the "operation" voltage is 6.0 to 12.8 VDC and not 12 VDC? I know that.
post #5 of 23
Quote:
Originally Posted by vipejc View Post

Then why does the manufacturer state the "operation" voltage is 6.0 to 12.8 VDC and not 12 VDC? I know that.

That means that if you send the fan anything between 6V and 12.8V on the wires, it will spin and not be damaged. The higher the voltage, the faster it will spin. Power consumed is just the input voltage multiplied by the current. More power input = more mechanical work being done per time (spinning the blades).
post #6 of 23
Quote:
Originally Posted by vipejc View Post

Then why does the manufacturer state the "operation" voltage is 6.0 to 12.8 VDC and not 12 VDC? I know that.
That's the min and max you can run it at, below 6v it wont run and above 12.8v it will be damaged. The fan header will supply 12v (and maybe less if it's able to adjust the fan).
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post #7 of 23
Thread Starter 
Quote:
Originally Posted by Darren9 View Post

That's the min and max you can run it at, below 6v it wont run and above 12.8v it will be damaged. The fan header will supply 12v (and maybe less if it's able to adjust the fan).

Does the stock fan not overclocked run at 12 VDC?
post #8 of 23
Thread Starter 
Anybody?
post #9 of 23
The fan (electric motor) doesn't affect the voltage, it receives whatever the power supply (the motherboard) supplies. It's a 12v fan header so the fan (any fan) will run at 12v.

It's the current that will change with more or less powerful fans. A more powerful fan will draw more current (amps) but still at 12v. You just need to be sure the fan is below 0.74A (the fan headers limit).
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PowerCaseMouseMouse Pad
Corsair HX1000 MM UFO-U2 R.A.T. 7 Contagion G.L.I.D.E 9 
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post #10 of 23
Thread Starter 
Quote:
Originally Posted by Darren9 View Post

The fan (electric motor) doesn't affect the voltage, it receives whatever the power supply (the motherboard) supplies. It's a 12v fan header so the fan (any fan) will run at 12v.
It's the current that will change with more or less powerful fans. A more powerful fan will draw more current (amps) but still at 12v. You just need to be sure the fan is below 0.74A (the fan headers limit).

The fan has a rated current of 0.70A. The motherboard fan header has a rated current of 0.74A. It's cutting it close, but I want the most bang for my buck. Is this too close for comfort? Thank you for your help.
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