Max amps possible on pci-e 12v line

Friar fish · Apr 25, 2014

Hi all,
Unfortunately i need to make up some custom wire looms due number of component in my pc.
All the standard 12/5/3.3v ports are
occupied so i'm eyeing off the pci-e ports on the psu. The beast has 6 8 pin pci-e ports! The advantage of buying a 1200w.
The problem is nowhere am i able to locate the max amps for the various 12/5/3.3v and pci-e lines.
Can anyone help?

Andrew

Damn_Rookie · Apr 25, 2014

I'm honestly not sure how much help I can be, but I can add a few things.

Firstly, you probably know this already, but the PSU's specifications (which are also written on the PSU's label) give you a rough idea of the maximum amperage for each of the voltages (3.3V, 5V, 12V etc). It's worth pointing out that the maximums for the +3.3 and +5 volt outputs are normally linked. For instance:

In this particular case the +3.3V has a max current of 30A (so a total wattage of 99), and the +5V has a max current of 28A (so a total wattage of 140). But the combined max wattage for those two is only 180W (as opposed to 239W), so you can't max out the amps on both those voltages outputs at the same time. This same idea holds true for the other output rails as well (you can't max out the 12 volt rail and also pull 180W on the 3.3 and 5V). Definitely something to keep in mind.

The other thing I wanted to add is that the 8 pin PCIe cables are rated to provide 150W each, so 12.5 amps for each one. 6 pin PCIe cables are rated for 75W.

Sorry I can't be of more help, but I hope what I've written proves in some way useful to you.

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Max amps possible on pci-e 12v line

Friar fish

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Damn_Rookie

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