4 12v railing with 18A enough for gtx 970

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dante007

dante007

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Jun 21, 2014
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hi.i currently have a asus gtx 660.but in 2016 I want to buy a new graphics card.but the problem is i do not know if my current psu will be able to power it or not.my psu is amacrox free earth 85 plus 650w.also it has four 12v railing with 18 A each. so are my railing also enough for the card? pls tell. sorry for mistakes. i will probably buy a gtx 970 or r9 380 in 2016 if prices are too high at launch.
thanks in advance.
 
Solution
DonkeyOatie
The system is a 650W PSU, but it has four rails each rated at 12V and 18A, which is 216W, so if all rails were loaded, that would be 864W on the 12V rails alone, so the PSU cannot deliver 18A of 12V power on all four rails at the same time because that totals to more power than the PSU is capable of delivering.

Taking power from two separate rails 2 x 18A = 36A which is more than you need. 28A at 12V is 336W, which is far more than any GTX970 will use except for sudden, brief, demand spikes. The energy use of a GTX 970 is around 150W under normal conditions, and up to about 200W when things get stressful.
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dante007

dante007

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thanks for reply donkeyoatie.so my psu can handle it right?and what about r9 3xx series?and which gpu should I buy to be far more future proof.i want to game at 1080p/60 fps.sorry for that but I don't want to create debate on this NVidia vs amd just asking for opinion.
 
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DonkeyOatie

DonkeyOatie

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I understand. I'm a fairly data-driven person. The PSU is powerful enough and you can get enough power for the 380 if you use two separate rails. For 'future proofing' (which includes resolutions higher than 1080p and frequencies higher than 60Hz and more than one monitor) The 390 is superior to the GTX 970.

Data: http://www.techspot.com/review/1019-radeon-r9-390x-390-380/page3.html

The main difference is the greater amount of faster memory.

At 1080p and 60Hz an never anything more, I'd go with the GTX 970 because of its much lower power use and cheaper PSU.
 
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dante007

dante007

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thanks.you previously said that the psu cannot deliever on all 4 rails.will u pls tell me the meaning of this.bcoz I don't know much more about psu.for example,as my psu has 18 A on 12 v rail each.but as gtx 970 needs 28A.so how the calculation is done?pls tell me.
 
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DonkeyOatie

DonkeyOatie

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Sep 16, 2014
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The system is a 650W PSU, but it has four rails each rated at 12V and 18A, which is 216W, so if all rails were loaded, that would be 864W on the 12V rails alone, so the PSU cannot deliver 18A of 12V power on all four rails at the same time because that totals to more power than the PSU is capable of delivering.

Taking power from two separate rails 2 x 18A = 36A which is more than you need. 28A at 12V is 336W, which is far more than any GTX970 will use except for sudden, brief, demand spikes. The energy use of a GTX 970 is around 150W under normal conditions, and up to about 200W when things get stressful.
 
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dante007

dante007

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Jun 21, 2014
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very very much thanks to you my friend.i very much appreciate your help.i was very much worried about this bcoz when I bought gtx 660 my low quality 450w psu was not able to power it so I bought 600w psu from amacrox only.but when I plugged my gtx 660 to it,at first it ran fine but when I increased my graphic settings it shut down several times.so I again bought this 650 w psu and it is running fine ever since.so thanks very much again.
 
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