P4S533 motherboard connection for 2nd chassis fan

  • Thread starter Thread starter The Ruzicka Family
  • Start date Start date
The said:
And I never implied that I thought anything else would fit. Of course, I
also never said it was plugged into the AUX 12V1 socket in the first place.




You're the only one who has suggested a "miracle."




I have replied to all of your comments, snide or otherwise, and therefore
never ignored anything you said. You, on the other hand, chose to ignore
the facts as I gave them to you. As you said, you can not see inside my PC.
I can. I am an engineer by trade (although not electrical) and can do a
decent job of examination. When I say that there is no adapter present,
there is NO adapter present.




Exactly! You can not see inside my PC. Bingo! And I have told you why
your suggestion is indeed incompatible: in order to plug the fan into th AUX
12V1 socket, an adapter would be needed, just like you said. But there is
NO adapter present. Therefore, this could NOT be how it was done.




Maybe THAT would be an explanation! I can not say for sure. All I do know
is that there is absolutely NO evidence of an adapter to plug into the AUX
12V1 socket. Where and what would I look for with these 5v headers? This
is the first I've heard mention of this.
Click to expand...

There are a number of connectors on the board to which are intended for
attachment of optional extras such as USB ports, chassis intrusion
detection switch, front panel LEDs etc. In some cases the motherboard
supplies +5v to the peripheral device via one of the connector pins, and
ground via another. Since the pin spacing of these connectors is the
same as on the 3-pin fan connectors, it would be physically possible to
connect a fan such that it received +5v from the motherboard if there is
a ground pin adjacent to a +5v pin - the speaker connector is one
example of adjacent +5v and ground pins.

Some 12v fans will spin (albeit slowly) when supplied with 5v, many will
not, but in theory this explanation could fit the facts you stated.
However, powering a fan in this manner is a bad idea to say the least.
 
There are a number of connectors on the board to which are intended for
attachment of optional extras such as USB ports, chassis intrusion
detection switch, front panel LEDs etc. In some cases the motherboard
supplies +5v to the peripheral device via one of the connector pins, and
ground via another. Since the pin spacing of these connectors is the
same as on the 3-pin fan connectors, it would be physically possible to
connect a fan such that it received +5v from the motherboard if there is
a ground pin adjacent to a +5v pin - the speaker connector is one
example of adjacent +5v and ground pins.

Some 12v fans will spin (albeit slowly) when supplied with 5v, many will
not, but in theory this explanation could fit the facts you stated.
However, powering a fan in this manner is a bad idea to say the least.
Click to expand...

THANK YOU! Now that does sound like a possibility that I'll have to
investigate. As I said earlier, I'll probably still do the simple thing and
buy an adapter, but it was driving me crazy trying to figure out how the
tech might have done it. If she did indeed do it this way, I would not have
known that it was an improper, or at least under-powered, method. Again,
thank you for a explanation that seems to make sense given that there was no
adapter in there before.
 
one last post, I dug out my manual, on the p4s533 and there is a standard 4
pin connector on the board to supply power to the cpu. The four pin
connector is the kind you find on the back of hard drives and cdrom player.
The tech could have used a splitter on this connection sending power to the
cpu and a extra fan. Not the way it should be done, but if it works who's to
know. That is all I can figure. That is my last and best guess.
 
Thanks! I'll see if I can find any evidence of this on the board. I
appreciate your thoughts on the matter!
 
The said:
Thanks! I'll see if I can find any evidence of this on the board. I
appreciate your thoughts on the matter!\
Click to expand...

BigJim is referring to the AUX 12V1 connector we already discussed...
 
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