Powermac G4 and ATX conversion : Revisited

5 replies [Last post]
Offline
Joined: Nov 24 2011
Posts: 17

This issue has been raised before. However I do need more answers. Sorry about that. Most forums cover adequately how to connect and splice the wires. They do not cover the connection of molex connectors from the ATX to the Mac drives etc. Do I assume that these connectors will carry the necessary load and the Mac will function ? I am aware that ADC displays will not work but about the Firewire 400 or any SCSI devices like Adaptec cards.
Any assistance welcome.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Offline
Joined: Dec 20 2003
Posts: 359
Re: Powermac G4 and ATX conversion : Revisited

The reason the ADC monitor doesn't work with the ATX conversion is that the ADC monitor requires 25 volts. Nothing else uses that voltage so ADC monitors are the only thing affected.

eeun's picture
Offline
Joined: Dec 19 2003
Posts: 1891
Re: Powermac G4 and ATX conversion : Revisited

The molex connectors on the ATX supply will connect to your various drives without modification just as they would with the stock supply.

No problems with Adaptec or other PCI cards. They don't use the +28V line so they'll work fine.

Never used Firewire on my converted MDD, so can't comment on that.

__________________

"Give a man a fire, he's warm for a day. Set a man on fire and he's warm for the rest of his life."
(Terry Pratchett)

Offline
Joined: Nov 24 2011
Posts: 17
Re: Powermac G4 and ATX conversion : Revisited

Thnks for the reassurance. I have also been told that FireWire devices with their own power supply should work as they aren't dependent on the Mac for power. Hope it's some use for other prospective PPC users.

Hawaii Cruiser's picture
Offline
Joined: Jan 20 2005
Posts: 1434
Re: Powermac G4 and ATX conversion : Revisited

The PCI Firewire cards I've had had four pins on the card to attach a mini-molex power connector in case you wanted to power a device through the card using one of the PSU's molex connectors (the ATX's floppy connector size). I've got a Formac TV/AV box hooked up to a bare PCI Firewire card with no PSU molex attached to the card and the device draws power without an external supply, but it probably doesn't need a lot of power.

Here's a couple links for the conversion threads:
http://www.applefritter.com/node/23054
http://www.applefritter.com/node/19551

Eeun's MDD ATX conversion story is another good one.

Offline
Joined: Nov 24 2011
Posts: 17
Re: Powermac G4 and ATX conversion : Revisited

The Firewire PCI card with a molex male connector is an interesting concept. If I hook a spare and unused molex connector with 2 outlets [P4 & P5] - from the Powermac G4 - to that PCI card, will it give me enough power to drive 2 HDD's ? Just a thought ! The ATX 400w unit has only one set of molex connectors.