molex adapter

[dadis25]

Dear Linus

 

I would like to ask if it possible to connect 2 fans Be Quiet Pure Wings 2 140mm (Operating Voltage DC 5V to 12V ) and I would like to connect to Bitfenix molex from 12V to 7V adapter.  I heard the PSU might have problems and uther staff is this throw.

I have  PSU PURE Power 10 500W. Please describe me because I have concerns.

 

 

[samcool55]

It's a fan, unless you somehow derp the connection and short it you can't do anything wrong.

 

Just connect it properly and don't worry about it.

[dadis25]

thank you so much I was thinking because another forums said that molex adapter had problems with PSU because of Voltage (returning voltage to PSU)

[r4tch3t]

It can in very rare cases cause issues as you are feeding current from the 12v to the 5v line, however the current draw on the 5v from other components should cancel this out anyway.

I've done it before, I had a fans with Molex plugs on them and changed the ground pin from the centre to the outside edge (red 5v rail). 

[dadis25]

thank you r4tch3t

 

but what should I new about that feeding  currebt the 12v to the 5v  line from odher components

[r4tch3t]

Basically it never causes a problem if your running a normal system.although if for willing to buy a cable you might want to get a cheap fan controller instead.then you don't have to worry about a tiny chance if something going wrong.

EBay has many link

[dadis25]

r4tch3t mabe you do not understand properly I have a new cabel Bitfenix molex adapter 3×3pin fan 7V but I do not use it right now because of  concerens. I do not buy a cheap conrrollers by ebay

 

[dadis25]

I would like to ask it is better to have this NOCTUA NA-YC2 Y-Cables for 3-pin fans(how new to have 9.6 or 12W) or  Bitfenix molex adapter 3×3pin fan 7V?

[r4tch3t]

If you already have the cable I'd use it.

The biggest problems with the 7v mod were bad wiring since there were no commercial adaptors and people did it themselves, sometimes badly.

So with the bad cable problem not being an issue you're probably more likely to get struck by lightning than have something go wrong using the adaptor.

 

As to the cheap eBay controllers, they can be good if you know what your looking for (I just assume everyone does as I'm an electrical engineer student and its second nature to me sorry)

If you still wanted the no risk option you can get a rear PCI bracket with knobs for each fan. It's not pwm but it's $20 and it'll work fine. Link to Amazon.

 

But personally i'd use the adaptor as you already have it.

[dadis25]

thank you for more informattions about that.

 

I put it on and work normally