Power Supplies +12v Ratings

Home built / E6700
December 27, 2010 at 08:01:50
Specs: Windows XP, Xeon X3450/4GB
I noticed that some ATX Power Supplies have a +12V-1 rating of say 24 Amps (no +12V-2 rating) such as the Power Up / 450-Watt, and others such as the Coolmax 400-W Power Supply V-400, has a +12V-1 rating of 14 Amps and a +12V-2 rating of 15 Amps.

Is it reasonable that the lower rated power supply of 400-Watts has a higher amperage of 29 watts if you add +12V-1 and the +12V-2 together?

I will be installing a PCI-E video card which requires 24 amps on the + 12 volt rail, so will either power supply work?

Power-Up URL:

Coolmax URL:

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December 27, 2010 at 08:21:47
A single 12 volt rail is always a better choice. You could use choice #1, but I would look at the corsair brand on Newegg.com. I still have my doubts about a $24.00 psu.

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December 27, 2010 at 08:25:37
Look for a Corsair with around 40A on the 12V Single Rail, avoid Dual Rails and budget PSU's, it is false economy to spend less than $50+:



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December 27, 2010 at 09:29:27
The two PSUs you selected are cheap junk. Looks like you based your choice on price, not quaility.

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