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Min. Power Requirements For Add On Video Card


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#1 baso3456

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Posted 25 November 2006 - 01:06 PM

According to tigerdirect I need a minimum of 250watts and a +12 current rating of 18 A. I have a 300 watt PS but it is only 16A. This spec is for a evga 7300GS 256mb card. My problem is that after looking at all of the Antec power supplied offered on Newegg, I see that very few of them have a rating of 18A. Most are 17A or less and even the Antec NeoHE 500 ATX12V 500W Power Supply only has a 17A rating which retails at $100. Am I correct it thinking that the spec on the tigerdirect site is false and I can get by with the PS I already own?

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#2 usasma

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Posted 25 November 2006 - 01:24 PM

The ratings are subjective because the power supply supplies not only the video card, but every other component that your computer uses.

I would suspect that your current PSU would handle this - but can't guarantee it. The only sure way is to try it and see. (FWIW, you can overcome minor power issues by disabling all the unneeded stuff that sucks up electricity).
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#3 Mr Alpha

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Posted 25 November 2006 - 02:13 PM

I would say that 18A on the 12V rail is a decent estimation of the power requirements. On the power supplies which had less than 18A on the 12V rail: did you check is they had two 12V rails? The 18A requirement would the be for the two 12V rails combined.
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#4 baso3456

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Posted 25 November 2006 - 10:07 PM

The antec 500 I mentioned above has 3 12volt rails, each rated at 17A. So what you are saying then is that this PS adds up to 51A and this is great. Is this correct? I have to add one more item I just discovered. For the same 7300GS 512mb card as I mentioned above, EVGA wants a mimimum of 250W@18A and I see that XFX is asking for 350W@20A for the same card.

#5 Mr Alpha

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Posted 26 November 2006 - 08:01 AM

The antec 500 I mentioned above has 3 12volt rails, each rated at 17A. So what you are saying then is that this PS adds up to 51A and this is great. Is this correct?

Yes that is correct, although I must add that PSU's cannot do full load on all 12V rails so the actual combined amperage on the 12V rails for the Antec 500W you mentioned is 38A which you can find by looking for the combined output for the 12V rails, usually found in the detailed specs.

I have to add one more item I just discovered. For the same 7300GS 512mb card as I mentioned above, EVGA wants a mimimum of 250W@18A and I see that XFX is asking for 350W@20A for the same card.

The graphics card isn't the only thing in your computer using 12V power, so their power recommendation is based on a guesstimate on what else you've got in your computer.
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#6 baso3456

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Posted 27 November 2006 - 03:10 AM

Thank you usama and Mr. Alpha for setting me straight on choosing and reading power supply specs.




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