Simviation Forum - Running the case fan straight from the PSU

Sep 4^th, 2004 at 6:31pm

Selbio Offline
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I bought a 4-to-3 pin connector to be able to run the case fan at full speed from the PSU connectors since the BIOS has it running at 40% to kill the noise. The power supply is not as hot anymore unless I'm playing some games then it starts to warm up a little. The voltages, the 5v went from 5.08v to 5.05v, the 3.3v stayed at 3.34v, the 12v which is usually at 11.19v goes down to 11.07v more frequently now when I'm playing a game. The pc isn't crashing and the temps went down by 2 C at the most.

I'm thinking about keeping the fan running at full speed specially since it's a 92mm one and I can feel 10 times as much air coming out now.
My question is, did the voltages go down because of the fan or because I tied all the cables together with one of the cables from the psu that was hanging. Do they create any problems being tied up like that?

Best Regards,&&Selby&&

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Reply #1 - Sep 4^th, 2004 at 7:31pm

Politically Incorrect Offline
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Quote:

Do they create any problems being tied up like that?

It is like putting a kink in a garden hose, kink it enough and the flow of water stops.

Grin

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Reply #2 - Sep 4^th, 2004 at 8:23pm

Selbio Offline
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So tying up the cables would actually slow the flow of electricity?
BTW I took out the 3-to-4 pin connector to see if voltages would go up and so far the 11.19 is staying at that and is not going down to 11.07 anymore. The 5v is at 5.08 now. THe cables are still tied up with one of the PSU cables but the fan is running out of the motherboard now.

Best Regards,&&Selby&&

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Reply #3 - Sep 4^th, 2004 at 10:32pm

Brett_Henderson Ex Member
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It is like putting a kink in a garden hose, kink it enough and the flow of water stops.

You can kink, bend, tie in a double-granny knot even shove'em between cooling fins on the heat sink... DC voltage will not be changed unless you start breaking actual strands of copper (and even the, not much effect unless it's a heavily loaded wire, where heat might be a concern).. As long as the circuit is intact... electricity flows Wink

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Reply #4 - Sep 5^th, 2004 at 12:45am

Selbio Offline
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Thanks for explaining that to me. I was confused about that Grin

Another question though. Using Speedfan and SiSoftware Sandra Standard the 12v rail is at 11.19v but using Asusprobe it says it's at 11.712v which is actually higher. Which one should I trust Asusprobe or Speedfan and SiSoftware Sandra Standard?

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Reply #5 - Sep 5^th, 2004 at 2:36am

SilverFox441 Offline
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On an Aus MB, I would trust the Asus tool...it is product specific rather than generalized.

Steve (Silver Fox) Daly

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Reply #6 - Sep 5^th, 2004 at 9:30am

Selbio Offline
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Thanks,

I have an HP motherboard but it's manufactured by Asus

Asus A7V8-LA

Best Regards,&&Selby&&

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Reply #7 - Sep 7^th, 2004 at 8:32am

Ivan Offline
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doesn't look like there are extra fan connectors on that one...
Never use the one close to the cpu for case fans as that one needs a higher RPM input signal

I'm running 2 casefans straight from the PSU, but on a wire that isn't used by other devices that need a stable power level

Russian planes: IL-76 (all standard length ones), Tu-154 and Il-62, Tu-134 and An-24RV&&&&AI flightplans and repaints can be found here

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Reply #8 - Sep 7^th, 2004 at 11:53am

4_Series_Scania Offline
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All my case fans (8 of the buggers!) are run via an old 250watt psu I had left from an earlier pc, thus, my psu just runs my board & graphics card. Everything else (HD, CD/RW, DVD etc) is running from the other psu. - weird results when I forget to power it up! Roll Eyes

lol

« Last Edit: Sep 7^th, 2004 at 1:33pm by 4_Series_Scania »

Posting drivel here since Jan 31st, 2002. - That long!

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Reply #9 - Sep 7^th, 2004 at 3:39pm

Fozzer Offline
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The wires coming from my 550 Watt PSU have loads of spare plugs....
Some of them being 4-pin plugs with cables coloured: red-black-black-yellow.
Yellow-Black is a 12 volt 16 amp supply.

I just poke the case fan wires, red wire into the yellow + socket, black wire into the black - socket,....and that turns my +12 volt case fans on... Grin

...!
I've fitted two extra case fans and powered them both this way... Wink

...!
No problemo...!

Cheers all... Grin

...!

Paul.

Dell Dimension 5000 BTX Tower. Win7 Home Edition, 32 Bit. Intel Pentium 4, dual 2.8 GHz. 2.5GB RAM, nVidia GF 9500GT 1GB. SATA 500GB + 80GB. Philips 17" LCD Monitor. Micronet ADSL Modem only. Saitek Cyborg Evo Force. FS 2004 + FSX. Briggs and Stratton Petrol Lawn Mower...Motor Bikes. Gas Cooker... and lots of musical instruments!.... ...!
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Reply #10 - Sep 7^th, 2004 at 11:25pm

Selbio Offline
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I went ahead and plugged the fan straight to the PSU that way is move air out. So far the pc is working fine except I encountered a different problem now( may not even be a big deal at all). The voltages seem to stay in the same range but they fluctuate more now but that's fine I guess.

Thanks all for the input.

Quote:

All my case fans (8 of the buggers!) are run via an old 250watt psu I had left from an earlier pc, thus, my psu just runs my board & graphics card. Everything else (HD, CD/RW, DVD etc) is running from the other psu. - weird results when I forget to power it up! Roll Eyes

lol

Two PSUs wow. How do you get the one that is not plugged to the board to power up?

Best Regards,&&Selby&&

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Reply #11 - Sep 8^th, 2004 at 3:40am

4_Series_Scania Offline
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I've just spliced together whichever two wires got the thing to go live!!! - A few sparks later, I found the right one! Roll Eyes

Not, the safe approach, but it worked!

Posting drivel here since Jan 31st, 2002. - That long!

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