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Very loud PSU fans in custom G5

post #1 of 18
Thread Starter 
I've been working on a minor case mod of building my next PC inside a mac g5 case.
In this I took apart an antec TP-750 PSU and put it inside the original PSU housing. This is what the orginal looks like:
661-3738.gif
There is no headroom for the antec top fans so I wired up the original fans to the connector using just +12V and - wires. The antec fan is 4 pin, 1 mac fan is 3 pin and the other is 2 pin. The wiring (by color) for the antec seemed a bit different than the 4 pin standard so I just used the direct power line and avoided the PWM.
Well, it is very very loud and I wouldnt mind quieting it a bit since it really overpowers the room.
I was thinking:
New fans: The fronts are 60mm which arent too hard to find but I dont know if new ones will be any queiter at 12V. recommendations on good fans if this is best option. Also maybe I could get some 4 pin fans that would match up with the connector from Antec. Know of any?
Potentiometer/Rheostat:Could be a good option.
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post #2 of 18
If you keep the mac 60mm fans, you can reduce the voltage with a couple Zalman RC56 resistors.

http://www.quietpc.com/us-en-usd/products/casefanaccessories/resistors (or find at your local radioshack (56ohm=7v, 100ohm=5v))

but theres no fan speed control and more important, no way of knowing how the speed reduction is effecting the actual PSU cooling.

If the Antec provides PWM support, you can replace them with 60mm PWMs and power them through fan header. This will make the PSU control the fans based on temps or whatever the specs call for, slower and quieter etc, etc., you'll also need to match the PWM pin configuation for 4-wire which should be standard (blk,ylw,grn,blu).

I found these at Frozen CPU http://www.frozencpu.com/products/5875/fan-290/Cooljag_Everflow_60mm_x_25mm_PWM_Fan_F126025BU.html?tl=g36c15s57 but based on the specs I just can't recommend them, so I'll leave that for somebody else to respond.

Lastly, you can also run the orig fans with a external fan controller(10-15w pot) you might find one at your local radioshack. Or, get a PCI slot controller http://www.svc.com/jax0033.html (what I use) or this one http://www.svc.com/fc.html with a 3/2-pin splitter.

Post your pics too!
Edited by gymenii - 3/29/11 at 11:55am
post #3 of 18
Thread Starter 
Thanks for the reply. I think I will give the Radioshack route a try for interim and try to find some fans that I can use with the PSU fan header.
My confusion with this is that the wire colors are not standard. They are red, black, blue and white. I am using the red as 12V+ and Black as - but dont know about the other two. Perhaps blue is PWM and white is sense? If i use smaller fans than the PSU is designed for wont it want to spin them at lower RPM than is needed?
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post #4 of 18
Thread Starter 
As per your request some pics
DSC07695.JPG
DSC07694.JPG

And here is the connector in the PSU
DSC07696.JPG
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post #5 of 18
Half of the puzzle is solved! Now, you just need to test the white and blue wires and this is easy to do.... the mfg will switch around the wires but the function is still the same.... so blue = pwm (pin3) and white is sense (pin4), for example, just switch 3,4 to the fan header. Start by finding the sense wire first smile.gif easy.

I don't know what specs Antec uses for fan duty cycle, though it's always based on load temps. I would try to match the amps to the fans maximum rating, or as close to it as possible. The mfg will typically over-rate the fans they use/install anyway so getting something close to spec should work fine.
post #6 of 18
Quote:
Originally Posted by seahuston;12920704 
As per your request some pics

Awesome thumb.gif

After seeing your pics makes me want to mod something. Oh well those days are over.
post #7 of 18
Thread Starter 
Thanks for the replies.
I'm thinking that I might get two new 4 pin fans to start it out right. Would there be any problems to splicing them together to reach the once connector on the PSU?
How does one find the sense wire?

Thanks for the complements. It has been a fun albeit time consuming project. Not done yet-still need to get the front and rear panel working and I have some 120mm fans for the front but it is a start.
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post #8 of 18
What about hooking up a GPU style blower fan? It looks like a very similar style of airflow to a graphics card. A long narrow rectangular tube.
    
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post #9 of 18
Thread Starter 
Hmmm,
In looking at the gpu fans it seems like this may take up more space than I have. Also, the design of case isolates the PSU so I wonder if a blower may end up recirculating warm air.
I think I will go with two new fans but thank you for the suggestion!
Currently I seem 2 options. Same model but different thickness. Any reason to go for one over the other. The thinner one has a higher CFM and the amps are .40 (the stock is .37)but also higher Dba while the thicker one is lower amps but quieter and lower Dba.
http://www.frozencpu.com/products/6158/fan-329/Cooljag_Everflow_60mm_x_15mm_PWM_Fan_126015BU.html#blank
http://www.frozencpu.com/products/5875/fan-290/Cooljag_Everflow_60mm_x_25mm_PWM_Fan_F126025BU.html#blank
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post #10 of 18
Now THAT gives the term "Hackintosh" a whole new meaning biggrin.gif
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