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How to tell amps on a dual 12v rail psu

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  • Power Supplies
  • Components
Last response: in Components
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August 9, 2011 1:19:17 AM

In my computer i have a 700w Raidmax RX-700AC Blackstone psu. im currently looking to upgrade the graphics. I was looking at a GTX570 which recommends a 38amp psu. my psu is a dual 12v rail design each with 23 amps. would i be able to run it. Do i combine the two rail amps to get the total amps. Thanks in advance.

More about : amps dual 12v rail psu

a b ) Power supply
August 9, 2011 1:38:07 AM

I think this should be right

[682W - (5V + 3.3V) * 25A] / 12V = 39.54A
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a b ) Power supply
August 9, 2011 2:31:44 AM

If each rail has 23 AMPS, make sure you use the 2 different PCI-E harnesses to plug into your card. ie not the daisy chain connectors, as they are obviously on the same rail.

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a c 1217 ) Power supply
August 9, 2011 5:13:50 AM

Raidmax Blackstone RX-700AC

Total Output: 700W

-12V: 6W
+5VSB: 10W
Max Combined +3.3V & +5V: 150W

700W - 6W - 10W -150W = 534W

534W / 12V = 44.5 Amps

The Raidmax Blackstone RX-700AC's maximum combined +12 Volt current rating of 44.5 Amps should be enough to run a system with a single GeForce GTX 570 graphics card.
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a b ) Power supply
August 9, 2011 5:29:13 AM

Yeah but each 12V rail is limited to 23A, so it's important to use 2 separate rails for the Gfx card.
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August 16, 2011 12:10:01 AM

Best answer selected by kpelton94.
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a b ) Power supply
August 16, 2011 2:26:25 PM

This topic has been closed by Mousemonkey
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