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My auto fan speed is 40%, why it is not 20%???

post #1 of 7
Thread Starter 
I am using HD5770 from Gigabyte. I just let all setting as default. The auto fan speed is 40%. I see in catalyst overdrive can turn that to 20%, while in afterburn can turn that to 25% manually. I tried to manually set it in aferburn and even with 25%, the temperature remains the same while I don't use my computer.

I feel 40% is wasting electronic energy while 20% or 25% can do the same job...any idea?
post #2 of 7
The cards downclock them selves while not in use so any fan speed 10% and above should yield similar temps.

Feel free to create your own fan profile that will increase speeds based on temps in one of the many overclocking software available for amd cards.
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post #3 of 7
Quote:
Originally Posted by doglivehk;15162872 
I feel 40% is wasting electronic energy while 20% or 25% can do the same job...any idea?

Fan power consumption is negligible
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by sLowEnd;15166824 
Fan power consumption is negligible

yeah then why the default is so high, 40%??
post #5 of 7
Quote:
Originally Posted by doglivehk;15182882 
yeah then why the default is so high, 40%??

So your card doesn't overheat.

Like he said though, a fan honestly pulls very VERY little power anyway. My old Delta 120's pulled a whopping 6w worth of power at full speed. I know your stock cooler doesn't pull anywhere NEAR that much, maybe 1-1.5w at full speed.

The speed and voltage of your GPU is what matters for power consumption....not the speed of your fan.
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by pioneerisloud;15182919 
So your card doesn't overheat.

Like he said though, a fan honestly pulls very VERY little power anyway. My old Delta 120's pulled a whopping 6w worth of power at full speed. I know your stock cooler doesn't pull anywhere NEAR that much, maybe 1-1.5w at full speed.

The speed and voltage of your GPU is what matters for power consumption....not the speed of your fan.

does the heat of gpu actually waste more energy than the fan voltage!?
post #7 of 7
Quote:
Originally Posted by doglivehk;15183696 
does the heat of gpu actually waste more energy than the fan voltage!?

Power (in watts) is voltage (in volts) x current (in amperes)
As such, high voltage in and of itself doesn't necessarily constitute high power usage. If the current is low, then the power is low too.

Have you ever seen or used a plasma ball?
Plasma-lamp_2.jpg
It's a high voltage, low current instrument. That's why it produces sparks, but doesn't shock you to death.

On topic:
Seriously dude, don't worry about the fan's power consumption. It's absolutely miniscule.

Yes, your GPU consumes more power than the fan. It's supposed to.
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Overclock.net › Forums › Graphics Cards › AMD/ATI › My auto fan speed is 40%, why it is not 20%???