Running the case fan straight from the PSU

[Selbio]

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?

[Politically Incorrect]

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.

[Selbio]

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.

[Brett_Henderson]

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...

[Selbio]

Thanks for explaining that to me. I was confused about that

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?

[SilverFox441]

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

[Selbio]

Thanks,

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

Asus A7V8-LA

[Ivan]

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

[4_Series_Scania]

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!

[Fozzer]

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... ...!
I've fitted two extra case fans and powered them both this way... ...!
No problemo...!

Cheers all... ...!

Paul.

[Selbio]

[4_Series_Scania]

I've just spliced together whichever two wires got the thing to go live!!! - A few sparks later, I  found the right one!  ::)  ;D  :o

Not, the safe approach, but it worked!