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Single 12v Rail or Multiple

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August 23, 2010 12:08:12 AM

My power supply lets me choose between a single 12v rail or Multiple 12v rails. I am running SLI gtx 480s. What should I choose? Its a Mushkin 1000w. Joule PSU.

I currently have it on Single 12v rail.

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August 23, 2010 12:37:12 AM

The reason why the rails are split is to reduce the chance of overload

Read this,

http://www.antec.com/Believe_it/PSU/Myth3.php
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a b ) Power supply
August 23, 2010 12:50:27 AM

i'd say it still has separate rails, but maybe just combines them in parallell to create 1 rail. I dont really know which would be more beneficial. you would think combining them as 1 rail would distribute power more evenly across them, therefore reducing the chance of overload if they are not connected properly.
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August 23, 2010 1:19:35 AM

i will go with 2 rails.
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August 23, 2010 4:24:51 PM

Best answer selected by brennon7.
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August 23, 2010 4:25:34 PM

I will switch to Multiple rails....The information I have says it will still provide rail fusion to compensate for higher demanding GPUS.
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a c 164 ) Power supply
August 23, 2010 4:32:00 PM

brennon7 said:
I will switch to Multiple rails....The information I have says it will still provide rail fusion to compensate for higher demanding GPUS.


you may want to read this about your "multi" rail PSU

http://www.jonnyguru.com/forums/showthread.php?t=3990


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a c 144 ) Power supply
August 23, 2010 5:09:52 PM

The discussions for this question appear all over the place. For single rail PSU's, I'd like to point out that PC P&C and Corsair have been building single rail PSU's for years with none of the problems that Antec talked about in their "myths".

I would also like to point out that, in addition to 3 single rail Corsairs (two more 400CX's on order before they disappear), I own two of Antec's older "multi-rail" PSU's. They are both good, solid units (550 watt and 650 watt TP3's), but a few minutes with a DMM show that both are single rail PSU's with no isolation between the rails.

A good single rail PSU is better than a mediocre multi-rail PSU. The converse is also true.
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a c 164 ) Power supply
August 23, 2010 5:19:06 PM

jsc said:
I'd like to point out that PC P&C and Corsair have been building single rail PSU's for years with none of the problems that Antec talked about in their "myths".



for all of antec's "single rail PSU are made by the devil!" they also happen to sell several single rail models (seasonic made as some of the brand's above)

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...




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August 23, 2010 5:20:00 PM

jsc said:
The discussions for this question appear all over the place. For single rail PSU's, I'd like to point out that PC P&C and Corsair have been building single rail PSU's for years with none of the problems that Antec talked about in their "myths".

I would also like to point out that, in addition to 3 single rail Corsairs (two more 400CX's on order before they disappear), I own two of Antec's older "multi-rail" PSU's. They are both good, solid units (550 watt and 650 watt TP3's), but a few minutes with a DMM show that both are single rail PSU's with no isolation between the rails.

A good single rail PSU is better than a mediocre multi-rail PSU. The converse is also true.



My PSU has a switch on the back that allows me to choose single or multiple. So for the purposes of my PSU a 1000w Mushkin, I want to know if there is a preference with SLI gtx 480s and an overclocked i7 930. The gtx 480s are not overclocked.

Here are the technical specs..
http://www.overclockersclub.com/reviews/mush1000w/3.htm
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a c 144 ) Power supply
August 23, 2010 5:31:12 PM

Several of the 1 kw and larger PSU's are true multi-rail PSU's. I'd say that if you can use the multi-rail feature, go ahead. It can't hurt, and might help in the event of a hardware failure.
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August 23, 2010 6:04:02 PM

jsc said:
I'd say that if you can use the multi-rail feature, go ahead. It can't hurt, and might help in the event of a hardware failure.


That is what I'm thinking.
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