Question about PSU
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Posted by Jake on August 13, 2006, 8:07 pm
Please log in for more thread options I am looking to buy a power supply. I know my video card alone will need 28a maximum on the 12v. If I get a power supply with 3 12v rails with 18a each, will this be enough? Or will I need to buy one with say 38a on a single 12v rail? Thanks | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Cuzman on August 13, 2006, 8:32 pm
Please log in for more thread options " I am looking to buy a power supply. I know my video card alone will need 28a maximum on the 12v. If I get a power supply with 3 12v rails with 18a each, will this be enough? Or will I need to buy one with say 38a on a single 12v rail? " You don't need all 28A on one 12V rail, unless there is only one 12V rail on the PSU. I wouldn't recommend buying a 20-pin motherboard and PSU for a new build though. The graphics card isn't the only item that uses 12V though, and you might be building a system with 97 hard drives and 163 fans. I doubt that, but you might do best to list your entire proposed system anyway so people can give you specific recommendations. | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Paul on August 13, 2006, 10:29 pm
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The highest consuming video card is X1900XTX at 10 amps on the +12V rail. That is no where near 28 amps. The highest consuming processors at stock speed, might be the Intel ones that have 130W TDP, and allowing Vcore conversion at 90% efficiency, that works out to maybe 12V @ 12 amps. An overclocked Pentium D 805 can draw more than that, but you probably aren't using that as the basis of a high end gamer. Stating your hardware inventory (all the parts used in your PC) would allow someone to estimate the necessary size for you. Paul | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by on August 14, 2006, 7:45 am
Please log in for more thread options Jake wrote:
> Hi,
> > I am looking to buy a power supply. I know my video card alone will > need 28a maximum on the 12v. Thats one freaky video card, suggest you reread the specs. NT | ||||||||||||||||||||||||||||||||||||||||||||||
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Posted by kony on August 14, 2006, 8:54 am
Please log in for more thread options On 13 Aug 2006 17:07:34 -0700, "Jake"
>Hi,
> >I am looking to buy a power supply. I know my video card alone will >need 28a maximum on the 12v. No, you don't know this. >If I get a power supply with 3 12v rails
>with 18a each, will this be enough? For what you really need, maybe. "IF" you have a power hungry video card, you'd be as well off not getting a psu with the 12V rails split 3 ways, instead one where there are two or one and rated honestly for at least 18A per the one used. > Or will I need to buy one with say
>38a on a single 12v rail? No, you don't need 38A and there are very very few PSU that can actually supply 38A regardless of their misleading specs. Those are peak and/or lab/low ambient temp ratings, not what most can do in a real system. As other posters already mentioned, you need to start by providing a concise but complete itemized list of all major power consumers in the system, including video, CPU, memory, HDDs, optical drives and other cards if there are many or they stand out as hungry devices. Also all USB or firewire devices if you have a lot of them and need them on 5VSB power. | ||||||||||||||||||||||||||||||||||||||||||||||
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>
> I am looking to buy a power supply. I know my video card alone will
> need 28a maximum on the 12v. If I get a power supply with 3 12v rails
> with 18a each, will this be enough? Or will I need to buy one with say
> 38a on a single 12v rail?
>
> Thanks