Hi, folks the fans can be modded to run near silently. There are PWM fans with non standard wiring.
I can confirm it works. with the right fan controller they are awesome.
Awesome Mod Dr. Glu!
Yup hypnotic correct. You will need to make a custom cable going to the fans from the original male g5 cpu fan connector, and another custom cable from the original female 6 pin socket going to two standard pwm connectors.
Also check and double check your wiring and test it first, before...
If you are looking for a pin-out for the original fans and that connector and socket you can find one here.
The original g5 fans work in a similar way to PWM and are four pin fans, but, they are wired differently.
Sorry to hear of your PSU mod has not gone to plan.
If you considering modding a psu to fit in the original apple PSU housing there are some small form factor SFX PSU's, that with a little modding to the original housing, fit without having to take a PSU apart.
I used one in my g5 mod...
I took a similar this approach for my first G5 mod. Used existing atx case back and tray, chopped it up and bolted it to the g5 chasis.
I still use that machine. It's solid...
Its very quiet.
Sorry my i7 920 was over clocked from 2.4 to 3.8ghz. Running at higher voltage too. 70c was impressive giving how much i was pushing the cpu. All cpu's are different. I could never get this up to 4.0ghz with raising the voltage to a dangerous level
At Stock clocks it...
I managed to get the cooler master 212 evo v2 to fit in my first mod. here .http://www.tonymacx86.com/powermac-g5/154451-2004-g5-atx-conversion-using-bitfenix-neos-case.html
It was tight though.
Incidentally the cooler master was very solid performer. At least as good as...
So you have enough PWM channels on the Arduino very cool.
Just briefly looking the specs its only 40ma per I/O pin.
And you need 600-750ma to drive the fan.
How are you going to increase the forward current for each channel? Just curious.
Its a great and very elegant solution. I...
I dug up the old post from "sheriff" too.
I also considered using a proper PWM controller using a raspberry pi. The problem I had with that was only one PWM channel on the pi. so would need to obtain a controller for more channels.
Never used an Arduino does it have many PWM...
I used a simple angle bracket and the existing PCI-E slot makers plastics to get this on the original existing mount points.
I needed to take about 6-7cm off the shelf to ensure it was not too clove to my main board. Out with the jigsaw, cut and sand it down and as I did with...
Next mod was the power supply.
I had discussed some ideas for power supply selection on the forums.
The G5 fans.
They are Delta fans. They are not silent, but, they push a lot of air. Very high CFM. If you modify like PWM fans with a controller and not like standard PC Fan. They can be run at 5v relatively quietly.
I searched the forums and found a pinout guide on an old thread...