Delta 38cfm problem... problem solved! Thanks!

[Urinal Mint]

OK, I got this Delta 38cfm fan for my PAL6035 HSF unit... I hooked the fan into the cpu fan header on my a7v133, powered up, and noticed that the cpu fan was pulling so much damned current that the image on my monitor was quivering.

So I decided to take the motherboard out of the fan equation and bought a 3 to 4 pin adapter so I could jack the Delta straight into the power supply.

Now, here's where the problem pops up...

After I plugged the adapter in and hooked the fan into the PSU, I powered up and noticed the fan wasn't spinning for sh1t. It was running at about 1500rpm (guess) compared to the 7000rpm it's rated at (and should be running at).

Can anybody tell me what the deal is here? I've had to revert to my other YSTech 28cfm fan on the Alpha for now until I can get this problem figured out.

thanks

 

[medic]

Is the adapter wired to the yellow 12V. wire?

 

[Urinal Mint]

No, it doesn't have a connection on the 12V yellow wire.

The wires on my 4-pin look like this: yellow, black, black, red
The adapter wires (a red and black) match up with the red and black on the PSU 4 pin.

red to red, black to black, black to nothing, yellow to nothing.

Is that sufficient info?

 

[Howard]

What is your power supply?

 

[DARRIN]

You are running your 12v fan on 5volts. You need your red going to your yellow.

 

[The Sauce]

Yah, CRV nailed it...the problem is that your fan got wired to the 6V line and not the 12V line. Just switch the red and yellow's on your pin converter and you'll be all set. Just a minor splicing job.

 

[Urinal Mint]

Yeah, that'll be a piece of cake... I'll probably swap that fan out tonight.

Thanks a lot fellas!!

 

[Raincity]

nevermind

 

[Bartman39]

Uh if that fan was causing that much of a problem via the board header their is a problem with the fan itself... Something to think about..?

 

[Urinal Mint]

Ian at 2cooltek.com already knows this fan pulls a monstrous amount of current, and it's suggested not to plug it into the motherboard because it has been known to short out fan headers... when he sells these fans he usually packages a 3-to-4 pin connector just for this reason. However, this fan didn't come with one... guess he forgot

Anyway, that's the reason why I'm doing this. It's already done in a ton of overclocked machines out there... the only drawback is that I can't monitor the fan speed at all

 

[Urinal Mint]

The fan has been rewired and now is spinning like a crazy mofo. Thanks a lot for the help fellas

 

[The Sauce]

Hey UM - you sure as hell can monitor the fan speed...that's exactly what I'm doing. I just spliced out the black and red to the power supply and left the yellow attached to the three pin connector and plugged that into the mobo header alone. Now I get a direct 12V supply to the fan and fan readings off the mobo.

And BTW...NEVER connect this fan directly to any mobo header. The ensuing sequence will go like this: Fried mobo header -> dead fan -> cooked CPU.

 

[Urinal Mint]

That's a great idea... I'll make that the project for next weekend.

The main deal is that I can still sense the cpu temp through the motherboard, so I'm not too concerned about the fan speed itself. If there's any drop in the RPMs I'll damn sure be able to hear it.