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In Reply to: RE: -12v not needed for GA-G31M-S2L motherboard startup... posted by GStew on July 25, 2010 at 20:22:31
-12v is not needed for motherboard startup, but the Power OK is. -12V is required if you have a card which needs it, such as Julia.
Follow Ups:
And what about +12v (for motherboard startup)?
Interesting.
JackWong, your response reminded me that I forgot to check the GA-EG45M-UD2H board with no -12v... and of course, it worked ok.
So now we have the following data points:
Boards that can boot without -12v:
- GA-G31M-S2L
- GA-EG45M-UD2H
- GA-H55M-UD2H (JackWong, I assume that's the main board you've been using... let us know what your experience with other boards has been)
Boards that require -12v to boot:
- GA-G31M-ES2L
This just gets better & better!
And of course, the Juli@ only needs -12v if you are using the analog portion of the card. The digital only uses the 5v rail (and regulates that down to 3.3v internally for some chips).
Mihaylov, I haven't tried starting a Mobo without the +12v. I assumed it was needed, but looking at the power usage table JackWong published in this thread: http://www.audioasylum.com/cgi/t.mpl?f=pcaudio&m=75904 , it may not be. Next time I have a chance to try it, I'll see if I can boot a board without it.
Greg in Mississippi
Everything matters!
Great! I can confirm that GA-G31M-ES2L require -12v and +12v to boot :(
Oh well... thanks for trying!
Greg in Mississippi
P.S. I think the next direction for fun experimentation is in the extreme motherboard power supply bypassing & power feeds ala JackWong... That's why I'm sticking with the S2L boards for awhile, I have several spares and want to learn to do this on these older, less-valuable boards! I've let the magic smoke out a few times doing mods and even doing this cMP stuff... no need to do that with a bright, shiney new board!
Everything matters!
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