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How do I overvolt a molex fan? - Page 2

post #11 of 23
It's been a long time since I did this but I'm pretty sure on a 20 pin PSU, if you use the purle and blue, your fan will take flight.
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post #12 of 23
Vantec Nexus NXP-205 Fan Controller.
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post #13 of 23
Quote:
Originally Posted by Mr.N00bLaR View Post
It's been a long time since I did this but I'm pretty sure on a 20 pin PSU, if you use the purle and blue, your fan will take flight.
Man if I look at the sky tomorrow and I see a PC in mid flight I am so calling you up on it...
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post #14 of 23
Quote:
Originally Posted by MrBungle View Post
i honestly can't think of an easy way to do that. my specialty is houses, not low volt systems, so maybe someone else knows a way.

the problem is that those fans already run on 12 Volts, and the biggest rail on a computer power supply is the 12 Volt rail. so there doesn't appear to be any overvolting potential there unless you use a different power source. it's probably a lot easier to just buy a higher CFM fan.
yes, but you have a -5 and a -12 line wich makes 17v
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post #15 of 23
Quote:
Originally Posted by Bal3Wolf View Post
You could try combining +12 and +5 i see some stuff on it but you probly would burn out the fan pretty fast. Probly very risky tho i wouldn't even try it.
By combining you mean twist the wires together ? That would create a short circuit, 7V difference. You can use the +12V as the anode (red wire) and the +5V as the cathode (the black wire)
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post #16 of 23
Quote:
Originally Posted by Bal3Wolf View Post
You could try combining +12 and +5 i see some stuff on it but you probly would burn out the fan pretty fast. Probly very risky tho i wouldn't even try it.
That would be less than what he has already (7v compared to 12v). Voltage is relative. Put 12v on the anode and 5v on the cathode, there is a 7v difference. And twisting the wires would not equal 7v, although the second half of the above post is accurate.
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post #17 of 23
Quote:
Originally Posted by TheFlyingWallaby View Post
That would be less than what he has already (7v compared to 12v). Voltage is relative. Put 12v on the anode and 5v on the cathode, there is a 7v difference. And twisting the wires would not equal 7v, although the second half of the above post is accurate.
Quote:
Originally Posted by Bal3Wolf View Post
You could try combining +12 and +5 i see some stuff on it but you probly would burn out the fan pretty fast. Probly very risky tho i wouldn't even try it.
I was right about to say that... 12+5 = 7, not 17.
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post #18 of 23
Check This out. It may assist you.

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post #19 of 23
What you need is a Step-up DC-DC voltage regulator. I use them all the time for making noise free guitar pedal power supplies... Maybe if I get time I'll try posting a guide for doing this, It could be an interesting idea you have...
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post #20 of 23
Don't you do something like plug the red wire of your fan into the Yellow of the molex (12v, right?) and then find the -12v wire on your 24pin ATX and plug the black wire into that.. then look at the difference, you will have 24v toasting your fan
    
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