Tom's Hardware > Forum > Graphic & Displays > Graphics Cards > 2 +12v rails and 1 graphics card
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alex14469   10-20-2009 at 08:31:53 PM

Hi, I have this Power Supply: Cooler master 500w
http://www.newegg.com/Product/Prod [...] 6817171031

it has 2 +12v rails each 18amps and only 1 pcie 6 pin connector

I know that this psu isnt exactly the best but if a video card requires 24amps and I only have 18 amps X2 can I safely run the card??? does it mean that I have up to 36amps? I read online that 1 12 rail is better but the one I have has 2 weak ones.

Thanks.

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DellUser1   10-20-2009 at 11:54:09 PM

The card doesn't require 24 amps, it is reccomended that the psu in the system you intend to put the card in, provide at least 24 amps ( doesn't matter if it's single or multi rail ).
Look at the label of your psu
http://www.newegg.com/Product/Show [...] r%20Supply
The combined 12v ouput is 360 watts or 30 amps.

Reply to DellUser1
alex14469   10-21-2009 at 12:39:04 AM

so what is the advantage of having a huge single rail? also, sorry if this is a stupid question but how did you get 30amps, I cant find it on the label, it only shows 2 12v rails 18a each and 360w combined.

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daedalus685   10-21-2009 at 01:13:00 AM

alex14469 wrote :

so what is the advantage of having a huge single rail? also, sorry if this is a stupid question but how did you get 30amps, I cant find it on the label, it only shows 2 12v rails 18a each and 360w combined.



well, 360/12 = 30.. high school physics :)

Anyway.. A single large rail does not really add much over a well built multi rail system. Though the first few multi rail systems were not set up very well and did not always both send multiple leads to a particular line, sometimes you would only get 18A (or whatever a single rail would be) at the PCIe connection.

PSU companies will go on about how single rail is more compatible blah blah blah, but so long as you are getting a quality unit it doesn't matter.

Reply to daedalus685
alex14469   10-21-2009 at 05:32:27 AM

thanks, i remember now, i just though that combined output of 2 rails is found by adding them, but 30amps is more then enough for my setup anyways

Reply to alex14469
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