Will multiple 12V rails on a psu affect power support?

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DarkDubzs

DarkDubzs

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Jun 10, 2013
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If i get a psu with 4 +12V rails at 20A each and i get a graphics card, like the GTX 780, and it requires 42A on the +12V rail, will that psu be able to properly support and power the graphics card?
 
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hunter315
Page six of the manual tells you how the connectors are laid out on the rails,
https://www.evga.com/support/manuals/files/120-PB-0750.pdf

Also, read the link in my sig below, i covered multirail vs single rail a while ago, it really doesn't matter, a PCI-E GPU shouldn't be consuming more than 25A total, 6.25A of which will come from the motherboard via the PCI-E slot. Your PSU has one set of PCI-e connectors on 12V2 and the other two on 12V4. The GTX 780 has a power draw of 250W(20.83A) so even if you use two connectors from the same rail the motherboard is picking up some of that load on a separate rail and you will be perfectly fine, it is an intelligently laid out PSU.
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ko888

ko888

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Feb 18, 2009
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If the multi +12V rail PSU is properly designed you don't need to worry about it.

What is the specific brand and model of the PSU that you are considering?
 
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hunter315

hunter315

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May 12, 2009
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Page six of the manual tells you how the connectors are laid out on the rails,
https://www.evga.com/support/manuals/files/120-PB-0750.pdf

Also, read the link in my sig below, i covered multirail vs single rail a while ago, it really doesn't matter, a PCI-E GPU shouldn't be consuming more than 25A total, 6.25A of which will come from the motherboard via the PCI-E slot. Your PSU has one set of PCI-e connectors on 12V2 and the other two on 12V4. The GTX 780 has a power draw of 250W(20.83A) so even if you use two connectors from the same rail the motherboard is picking up some of that load on a separate rail and you will be perfectly fine, it is an intelligently laid out PSU.
 
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