What psu watt for my build.

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aevm
I'd buy another HD 7950 and an 850W psu, and forget the R9-280x. It makes no sense to throw out a HD 7950 and pay $450 for a slightly better R9 280x. Upgrades should bring serious improvements to be worth the cash.

HD 7950 Crossfire: Sapphire recommends an 850W PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202026

R9 280x Crossfire: Sapphire recommends an 1000W PSU. Look under specifications here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202083
However, that's ridiculous, I'd go with 850W for this too.

PSUs:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139022
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151108
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aevm

aevm

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May 18, 2007
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I'd buy another HD 7950 and an 850W psu, and forget the R9-280x. It makes no sense to throw out a HD 7950 and pay $450 for a slightly better R9 280x. Upgrades should bring serious improvements to be worth the cash.

HD 7950 Crossfire: Sapphire recommends an 850W PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202026

R9 280x Crossfire: Sapphire recommends an 1000W PSU. Look under specifications here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202083
However, that's ridiculous, I'd go with 850W for this too.

PSUs:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139022
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151108
 
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Solution
aevm

aevm

Illustrious
May 18, 2007
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Various manufacturers list 850W or 1000W as a minimum. Each card consumes up to 295W under load. Add 77W for the CPU, you're already too close to the max.
 
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ko888

ko888

Titan
Feb 18, 2009
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For a system using a single Sapphire TOXIC R9 280X 3GB GDDR5 graphics card a minimum of a 750 Watt or greater system power supply is recommended. The power supply should also have a maximum combined +12 Volt continuous current rating of 45 Amps or greater and have at least two 8-pin PCI Express supplementary power connectors.

For a system using two Sapphire TOXIC R9 280X 3GB GDDR5 graphics cards in 2-way CrossFireX mode a minimum of a 1000 Watt or greater system power supply is recommended. The power supply should also have a maximum combined +12 Volt continuous current rating of 74 Amps or greater and have at least four 8-pin PCI Express supplementary power connectors.
 
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Someone Somewhere

Someone Somewhere

Titan
Sep 23, 2012
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Your existing PSU is fine for a single 280X, but if you got two I'd be looking at 850W+ from the list in my sig.

You may be better off with a larger single GPU, though. Crossfire is something to be avoided unless necessary, usually.

I'd have no trouble with a single 290X or 780Ti on that PSU.

Also remember that AMD cards are currently in ridiculous demand because of Litecoin, and thus overpriced and hard to find.
 
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ko888

ko888

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Feb 18, 2009
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A Sapphire TOXIC R9 280X 3GB GDDR5 itself draws 360.62 Watts when running FurMark stabilty testing according to ht4u.net's review of that card.

When I recommend a PSU I take into account the possibility that the user may run FurMark. I'm not naive enough to assume that the user won't or shouldn't. This ensures that the user is able to run bitmining if they so desire since it uses a lot more power than gaming does.
 
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I

intentions

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Jan 23, 2012
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I guess It would be smarter to snag another 7950. My mobo is fine for crossfire correct?
 
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ko888

ko888

Titan
Feb 18, 2009
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It will work. The primary card will get 16 PCI Express lanes but the second card will only get 4 PCI Express lanes with that motherboard. It's not the ideal 8 PCI Express lanes per graphics card like the better Z77 chipset motherboards though.
 
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