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How important is 12V rail????

post #1 of 3
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I have a mATX system and the 12V rail on the PSU is at 16A. I'm not doing any extreme OCing on the machine. I only have one LED cooling fan on the heatsink and one vid card which doesn't really draw much power. I added a TV card to the machine and it worked for a while but now when I turn on the comp, the machine doesn't boot up but I do get a light on the mouse and the lights on the keyboard to light up. When I take out the TV card, the machine works again... I'm beginning to think that it may be the PSU, but I'm only running a vid card and one LED fan... The PSU is a Chiefmax 350W and the 12V rail is rated at 16A - a replacement for the OEM PSU that was at 200W, 12A for 12V rail. Does it sound like PSU?
    
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post #2 of 3
Hmm.. are all of the drivers porperly configured for the tv tunner, does it work in other PCs? I would shoot for a new PSU around 350ish watts and 20amps.
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post #3 of 3
I'm running my machine on a generic 350W psu with only 12A on the 12V rail and it's oc`ed to 3.36 GHz... rock stable (10 hours on Prime95 with no errors). That's just to give you an idea/reference.

I agree with Mr.N00bLaR about getting yourself a good psu with a solid 12V rail. Your components will "thank you" for it and you'll surely run a more stable system but you need to make sure the one you have now is the culprit before you rush in and get another one only to find out your machine still won't boot !

Try another psu (a friend's maybe) if they accept to uninstall it that is !
You can also try to take some load off your current psu by removing/disconnecting non vital parts (if any).

I'm getting myself a brand name psu (around 450W + at least 25A on the 12V rail) very soon because I intend to further overclock my machine.

To answer your original question: The 12V rail is the most important on P4 machines. Both the cpu and the vga card draw their power from it.
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