Those are standby rails. You can connect the 5v of ATX to the 28V of the Mac and be able to boot(but you are not going to be using Firewire or ADC displays) but I have noticed that if you keep it that way for a long time it eventually starts having trouble cold booting. For my DA at the moment I found a 24V 4A dell notebook power adapter and wired it into my ATX extension. It has been working well but I do not have any ADC displays or bus powered FireWire devices to test it with. All I know is that it is not developing an issue overloading on cold boot like the couple other PSUs I had been swapping in and out during it's life and during hardware changes.Trash80toHP_Mini wrote:On the ATX: what the heck is the 2.5A +5Vsb rail, Processor or VidCard Power?
On the DA what the dickens is a 4.04A +28V VS Rail?
Seasonic & Corsair are loved brands. As is Antec.Trash80toHP_Mini wrote:Does anyone have a suggestion for a suitable ATX PSU?
If you're up for some fun, you could buy a chip to produce a higher output from 5 or 12V. Maxim and Linear Technology both sell suitable parts (do a search for "voltage doubler" and "boost converter"; check specs to make sure they'll survive at, say, 30V or so for margin). You'll need a small handful of cheap parts to get the job done, but both companies have very good app notes to guide you
Oh shoot, I am sorry, it is 20v.. Still good though.
Bunsen wrote:power up has been achieved, AGP video is working.
I used the +5VSB standby power (purple) lead for the +28V feed.
Trash80toHP_Mini wrote:the FireWire implications are important for my USB 1 ONLY OS of choice!
The outofspec page has the front panel header pinout, just momentarily connect pins 3 and 6 shown on the page.Trash80toHP_Mini wrote:First I need to eliminate the Power Button Board before I mangle the original PSU via cable-ectomy.
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