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Jun 19, 2013, 12:05pm

aquamac forums :: OSX 86 Forums :: OSX 86 Hackintosh Mods :: Mac Pro PSU to ATX adapter (?)

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Topic: Mac Pro PSU to ATX adapter (?) (Read 7,967 times)

blackknight
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #15 on May 8, 2010, 4:18am »

First of all, great job!!! Second, there are a lot more 12V wires than on the ATX because several will be dedicated to GPU, HDD, etc. and don't go to ATX. GND=GND regardless of the connector, so it doesn't matter, just that there is one ground wire for each power wire for current balancing. If you connect two power drawing devices on separate rails and use the same ground wire, you have the current from two different power rails going through a wire of the same gauge and that could be bad. It might not be an issue, but I wouldn't risk it. My suggestion would be to save V5 for GPU and V3 for SATA. The rest probably don't matter too much.

I don't really understand what you mean by W/O and C/B. don't all of the wires go to the PCB in the PSU? How do you know if they are W/O or C/B?

You can cut the wires as long as you know how to solder well and make sure you use heat shrink on all wires you solder. I also recommend buying a 24 pin ATX extension cable to work with rather than cutting up a power supply. The advantage is that you'll then have some color-coding rather than the all black wires. You can sleeve them afterward for aesthetics if you want. I've tried pulling the wires out of those Apple connectors and it's near impossible without destroying the locking pins. I actually used one of those power cables as an 8 pin ATX power cable extension and ran it behind the motherboard. All of the cables are straight through. I had to reconfigure the cable as it had two wires missing in the middle of it that I needed and the wires held pretty well even though I yanked them out of the connectors.

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pirloui
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #16 on May 24, 2010, 7:45pm »

Congratulations with nice research!
I have recently moved and got new job, so I'm a bit out of the hack thing, but hope to soon be back.
I can get hold of the PSU boad I have and take some more picture, whatnot could be usefull..
Cheers!

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kg216
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #17 on Dec 28, 2010, 4:30pm »

Have you made any progress with your PSU conversion since May?

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benproiii
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #18 on Jan 27, 2011, 1:19am »

I Think the PSU makes only 12v do you think the psu, gpu, hd, and, cd could run directly form the 12v and the 5v and 3v could be made with a 150W pico PSU adapter could the pico psu power a normal atx mobo

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blackknight
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #19 on Jan 28, 2011, 6:27pm »

You could probably easily find a 12V to 3.3V regulator or 5V to 3.3V regulator that would work and create less headaches than running a separate power supply like the pico PSU. Could probably build one too for not much money.

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mooner
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #20 on Jun 6, 2011, 3:11pm »

Has anyone made any progress on getting the Mac Pro power supply to drive a standard ATX board??

I'm getting ready to attempt this, but I don't know how to generate the -12v feed for the ATX connector.

Looks like +12v, +5v, +3.3v would all be pretty simple...

But ATX also has a -12v lead...

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shikikanzero
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Re: Mac Pro PSU to ATX adapter (?)
« Reply #21 on Oct 11, 2011, 3:43am »

so ive been working on this conversion for the last couple of days, i found that the -12v line isnt needed, and the pwr_ok line can be tricked by connecting it to a 5v line. but what im having problems with is that all lines are all live even before the pwr_on signal is shorted. on a normal ATX supply the only live power line is the 5v standby line, and nothing else. its only after the pwr_on signal is shorted that the rest of the lines go live. is this normal for this power supply? if so is there a way around this?

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