if you had a G4 sawtooth (10 pin logicboard powerconnector), you could have used pretty much any ATX and adjust the pinout. if you have any other G4, such as your quicksilver, you will need a PSU with one 28V lead. the board will not work without the 28V. this means: forget any ATX PSU. in this case i might suggest an MDD-PSU. they give 380 or 400 W and are relatively easy to find on ebay due to apples past exchange program for noisy MDDs. Pinout must be adjusted in any case! btw: the old quicksiver PSU can be sold on ebay for a good price. there is a high demand as they seem to be the most failing component in quicksilvers....
yes, the 28V is required for the logicboard to work. (i tried a DA and a QS with 12V instead of 28V - didnt work). maybe there is a hack, but i never found out. as far as i know, this is valid for all G4 except the sawtooth. fyi: the G5 models seem to boot nicely with a converted ATX-Powersupply.
shame i can't find that page with all the pinouts again. every model has its own pinout, so watch out.
I would recommend against going with two separate PSUs. I think you need a decent, high-wattage unit to mod. I built a smurf back in the day and the HD wasn't recognised when on the built in IDE bus but a separate PSU (from an external enclosure). Last week I encountered the same phenomenon with an MDD and a drive running from a SATA PCI controller.
I have run MDDs with 5 drives in them on the stock PSU with no issues. One was a dual 1.42GHz, the other was a single 1GHz upgraded to dual 1GHz. If you have an older G4, it would seem fair to assume that it will be drawing less juice than either of these. Going by memory, none of the MDD PSUs exceeded 400W by much.
Based on this, I would say a 600W unit would be a pretty safe bet. With this many drives doing a fairly important job, it might be worth forking out for a more expensive, high quality model.
If you want to take the time, you could look up the power consumption of the drives you have your eye on. And I'm sure you can find the consumption of your G4 chip too. I believe Seagate have recently launched some low power drives too.
Ok, a little disappointed here. Oh well, I was trying to build a raid system that could do what was stated above, but also shut itself down on weekends, and restart on monday(Energy conservation, plus their location gets real hot during summer months especially on weekends when AC systems don't run as much).
I was also trying to centralize all backups and archives into 1 location. I do have some old MDD G4's lying around, I could just build an archive system on that, and keep backups on separate system.
Waragainstsleep, yes, I was planning on using a raid controller from highpoint.
I would consider using a MDD logic board in an ATX box (they got just as hot as Quicksilvers!), but Its kinda hard to fit their logic board into a ATX case when they inverted PCI placement.
Maybe we'll just use external FireWire or eSATA raids. If i was planning to iSCSI, i would have them invest in something like an Xserve, with some sort of storage.
Keep the suggestions coming, I'm still in planning stages.
peecee works for me ;D i'm running a QS 733 overclocked to 933 with a pc ATX supply here. i used the +5vSB for pin 22, +12 for pin 9, changed pin 8 to +3.3, changed pin 19 to GND, and so far no problems. i used an ATX extender and modified the wires in the extender so that any standard ATX supply could be plugged in without worring about wires and such. watch out, on the seperate 4 pin +12v feed connector, it's backwards from the ATX supply (swap yellow and black) at the logic board end. compare with the original supply to double check!
i gather from reading boards that external power firewire devices would not work, and using an ADC monitor would not work. i have neither, so can't comment. i'm using a flashed 9800, 1.5gb ram, sata pci card, and a couple of 500gb drives, and have not had a single problem. best of luck.
4JNA, you've said you've done it successfully, so now I'm interested again!!!!
I'll look at your pin outs again and check. I am concerned about Firewire. We use external Firewire 400/800 drives (OWC Mercury Elite Pros) and rotate them every 2 weeks. I guess you meant bus powered FireWire? And as far as ADC, this unit will be headless, so I wont even need a display.
Also, any particular ATX PSU you selected? Recommend?
Please let me know, gears are a turnin i my mind!!!
CONFIRMATION: i checked the new info on my frankenstein mac. switching the 28V with 5vsb works! cool! that gives plenty of possibilities in reanimating dead macs with cheap ATX-supplies. thanx 4JNA! firewire works too. if its buspower is on or not doesnt matter to me.
Xplain's use of MacNews, AppleCentral and AppleExpo are not affiliated with Apple, Inc. MacTech is a registered trademark of Xplain Corporation. AppleCentral, MacNews, Xplain, "The journal of Apple technology", Apple Expo, Explain It, MacDev, MacDev-1, THINK Reference, NetProfessional, MacTech Central, MacTech Domains, MacForge, and the MacTutorMan are trademarks or service marks of Xplain Corp. Sprocket is a registered trademark of eSprocket Corp. Other trademarks and copyrights appearing in this printing or software remain the property of their respective holders.
All contents are Copyright 1984-2010 by Xplain Corporation. All rights reserved. Theme designed by Icreon.