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Will something like this damage my PSU? 7v Molex - Page 2

post #11 of 21
you dont need a resistor

5+7 = 12

the volt (potential difference) when 12v gets dropped to 5v gives you 7v. nothing unsafe or bad for the PSU however just dont have too many fans doing this. some PSUs dont like the fact that there is a 5v feed back though normally there wouldnt be any because you would have other devices like HDD sinking the rest of the 5v draw

i wouldnt prefer the resistor method if i can avoid it, sure it sounds safer but at the same time its wasting alot of energy through that resistor by heating it up

the only time i'd prefer to use a resistor is when it is a POT (variable resistor) for fans that are voltage controlled otherwise PWM is the better way
Edited by akromatic - 1/11/14 at 6:01am
post #12 of 21
Quote:
Originally Posted by steven88 View Post

Ahhh, yes I know "those" exists....I have one from my Noctua....I was actually looking for a molex with a resistor built into it....not a 3 pin fan cable with a resistor.

Yeah, I guess I can go that route....but I would have to buy four of those 3 pin fan cables versus one molex if I went the molex route.
Don't worry about it. Using that "voltage divider" thing is not entirely safe. Accidentally reverse it and you will be looking at 19V smile.gif
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post #13 of 21
Quote:
Originally Posted by DaveLT View Post

Don't worry about it. Using that "voltage divider" thing is not entirely safe. Accidentally reverse it and you will be looking at 19V smile.gif

more like -7v
post #14 of 21
Thread Starter 
http://www.ebay.com/itm/7-volt-4-Pin-Fan-Adapter-Cable-Speed-Reducer-NEW-/370972187579?pt=US_Computer_Case_Fans&hash=item565faa5bbb

LOL, this is confusing. So is this part safe or not? I have four fans connected to a single molex off my Seasonic PSU. I want to lower all four of my fans thru the molex. Can I buy the above part and achieve this, without harming my PSU or other components?

Yes I know you can buy four individual fan speed reducers...but I want to keep it simple. Will the above part work and not harm anything?
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post #15 of 21
Quote:
Originally Posted by steven88 View Post

http://www.ebay.com/itm/7-volt-4-Pin-Fan-Adapter-Cable-Speed-Reducer-NEW-/370972187579?pt=US_Computer_Case_Fans&hash=item565faa5bbb

LOL, this is confusing. So is this part safe or not? I have four fans connected to a single molex off my Seasonic PSU. I want to lower all four of my fans thru the molex. Can I buy the above part and achieve this, without harming my PSU or other components?

Yes I know you can buy four individual fan speed reducers...but I want to keep it simple. Will the above part work and not harm anything?
I'm telling you it might. Just buy the individual reducers
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post #16 of 21
A lot of people use these but they are technically not safe. The problem is that the 12 volt line will try to pull the 5 volt line up through the fans. If the fans draw more power than the components on the 5 volt line then the 5 volt line will try to feed current back into the PSU this can result in an increase in 5 volt line voltage which could kill components.
post #17 of 21
but because you have other 5v drain devices its fine

quality PSU would just shut down if they detect abnormality, components wont die
post #18 of 21
As an electrician I can say, buy them, you'll be fine...

You have 12V and GND in a molex. You have 5V and GND in the same molex.

So that means: When you measure between the GND and the 5 or 12 volt, you'll measure 5 or 12 volt (duh)

But when you measure between 5V and 12V the POTENTIAL differance is 7V (you don't measure it by comparing it to the GND)

And because it's all coming from ONE psu, all the + lines are on the same potential (if you would have a L1-L2-L3 PSU, things get different wink.gif )


So BUY the 12V molex to 7V molex adaptor

+5V (is still the - as it is lower) and +12V (is the + as it is higher) so you have a +7V line. And that's what you put on your 12V fan's, so the'll turn slower
   
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post #19 of 21
pretty much what i've said about POTENTIAL difference, its safe so dont worry too much as long as you arnt over doing it
post #20 of 21
Thread Starter 
Thank you akromatic and ASUSFreak. I was just hesitant because DaveLT was like....yeah it should be safe...wait no it's "maybe" safe....so I'm like, uhhh so what's the deal? lol

http://www.ebay.com/itm/7-volt-4-Pin-Fan-Adapter-Cable-Speed-Reducer-NEW-/370972187579?pt=US_Computer_Case_Fans&hash=item565faa5bbb

But if you truly insist there will be no harm in using this part...I'll take your word for it...and place my order smile.gif
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