Amps on the +12V rail question.

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Silent Gary
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Joined: 07/29/2009
Posts: 25

I'm sure a lot of you have heard about the new GTX580 series that has recently been released. Whilst reading about this card, I found out that the minimum requirement of Amps on the +12V rail is 42. I than looked at my power config chart and found that it has 25 amps on both my +12v1, and +12v2 rails. I was wondering if the PSU makes use of both rails at the same time, and would result in a total of 50 amps, which would be enough to power the GTX580.

Link to my PSU's Power Config Chart, I have the 700W version.
http://www.ocztechnology.com/images/awards/mxsp_wattage_charts.jpg

sherretz
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Joined: 07/10/2003
Posts: 100

In short, it's not a straight doubling of your capacity. It depends on how your rails are set up. If both of your PCI-E connectors are on the same rail (unlikely, but you never know), you could still run into issues. You could also run into issues if all your other devices (optical, hdds, etc) load up one rail, even if the PCI-E connectors are split across both rails.

I'm unsure if there is any way of determining which connectors are tied to which rails without cracking open the PSU itself. On the surface, I think you'll be ok though.

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Silent Gary
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Joined: 07/29/2009
Posts: 25

Ok. Thanks. I am planning on getting one GTX570 instead, so that drops it down to 38 amps, so it should work out.
-Gary