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Old Dell Fan can spin at 3,800 RPM? - Page 3

post #21 of 31
Quote:
Originally Posted by drjoey1500 View Post
Lol, considering the amount of air and the level of pressure that delta puts out I doubt you'll see much difference with two. I'm not about to tell you not to try it though .
Actually, the stock fan may be impeding his airflow.

OP: simply remove your pull fan and compare it with Dell+stock. Only then add the second Dell. Whichever is the better temps, go with that.
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post #22 of 31
I have 292X38mm beta 5's. They spin at upwards of I think 5000 RPMs at full speed, and move a lot of air and have massive static pressure. They came out of Dells.
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post #23 of 31

no fast fans you say

looky here



need to make a new vid
added more louder fans
Edited by 3dfxvoodoo - 4/13/11 at 11:18pm
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post #24 of 31
The issue with those fan is not their rated current, most often is their inrush draw which is insane. Measured with an o'scope my fan, input rush is somewhat in the 10+ amps area, and even if it last only half a second, it's a pretty stress for any MB components, especially the mosfets that are pwm controlling your fan and might die for this short-period semi-short circuit.
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post #25 of 31
the cpu fan on the stock cooler that came with my x6 maxed out at around 7500rpm (yes it was loud) hense why i replaced it with something more silent and mroe efficient
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post #26 of 31
Quote:
Originally Posted by Andrea87 View Post
The issue with those fan is not their rated current, most often is their inrush draw which is insane. Measured with an o'scope my fan, input rush is somewhat in the 10+ amps area, and even if it last only half a second, it's a pretty stress for any MB components, especially the mosfets that are pwm controlling your fan and might die for this short-period semi-short circuit.
are you referring to me
cuz my fans are rung at a lower current then their rated current
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post #27 of 31
it was more for juganot, I dunno btw how low speed is done by the motherboard... if it is just a PWM driving the DC motor, the output voltage will be still 12v with a low duty cycle, making the inrush current still high. If however, the mainboard uses a more advanced method (Buck DC-DC converter topology) on the fan port will be getting a different votlage, resulting in a different spinup current.

However, whatever is the speed you're driving those fans at, I would not hook them at all to the motherboard. even at 8V, as they're designed to run very fast (then probably inefficient at low voltages), the motor has a inrush peak current pretty relevant which might cause damage. Better get a 3-5A/Line rheobus to drive those.
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post #28 of 31
Thread Starter 
I had the fan running on my motherboard for around 5 hours. It doesn't work if I just put it on a 4 pin but it does work if I turn the connector on the fan around and cross it between two fan connectors which are side by side. I think I will unplug them till I get a safer way to run them not on the motherboard or I may just put them as case fans and run them directly from the PSU via a PCI fan controller thingie.
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post #29 of 31
I think there's an entry on Wikipedia that details wire assignments on Dell fans, and how to translate to standard plugs.
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post #30 of 31
Quote:
Originally Posted by ehume View Post
I think there's an entry on Wikipedia that details wire assignments on Dell fans, and how to translate to standard plugs.
You may be right, I havent looked into it. But I do know the power wires are in a different location, and you have to remove that clip that they use to hold them in, and remove the 5th blank pin on the fan's connector. I think one of the power wires is in the location of the PWM lead on a normal motherboard. Coz dell does stuff bass-ackwards.
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