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What psu watt for my build.

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January 16, 2014 6:02:41 PM

At the moment I have this psu. http://www.newegg.com/Product/Product.aspx?Item=N82E168... Would I need to get a new one if I swap my 7950 for 2 r9 280x toxic

i5 3570k
8gb corsair veng ram
256gb ocz vertex ssd
sapphire 7950 3l (Wanting to swap this for 2 r9 280x crossfire)
asrock z77 pro 4 mobo
coolermaster hyber 212 evo cooler

More about : psu watt build

a b U Graphics card
January 16, 2014 6:04:45 PM

If you want to do the crossfire later, then you'll need a 750W quality power supply.
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Best solution

a b ) Power supply
a b å Intel
a b À AMD
a c 143 U Graphics card
January 16, 2014 6:15:59 PM

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=N82E168...

R9 280x Crossfire: Sapphire recommends an 1000W PSU. Look under specifications here:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
However, that's ridiculous, I'd go with 850W for this too.

PSUs:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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a b ) Power supply
a b å Intel
a b À AMD
a c 143 U Graphics card
January 16, 2014 6:20:17 PM

ProWilma said:
If you want to do the crossfire later, then you'll need a 750W quality power supply.


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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a c 1168 ) Power supply
a b å Intel
a b À AMD
a c 541 U Graphics card
January 16, 2014 6:20:26 PM

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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a c 115 ) Power supply
a b å Intel
a b À AMD
a c 145 U Graphics card
January 16, 2014 6:20:40 PM

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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a b ) Power supply
a b å Intel
a b À AMD
a c 143 U Graphics card
January 16, 2014 6:27:09 PM

This thread is fun... ko888 says minimum 74A and SR-71 recommends a PSU rated 70A (just like I did, LOL). Come on, is 70A enough or not?
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a c 1893 ) Power supply
a c 101 å Intel
a c 335 À AMD
a c 719 U Graphics card
January 16, 2014 6:28:08 PM

That is made by CWT ^
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a c 1893 ) Power supply
a c 101 å Intel
a c 335 À AMD
a c 719 U Graphics card
January 16, 2014 6:30:58 PM

I linked the wrong one ko888 is right on that that setup.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Cooler Master V1000 1000W 80+ Gold Certified Fully-Modular ATX Power Supply ($179.99 @ Microcenter)
Total: $179.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-16 21:29 EST-0500)

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a b ) Power supply
a b å Intel
a b À AMD
a c 143 U Graphics card
January 16, 2014 6:32:31 PM

Makes sense now. Thanks!
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a c 1168 ) Power supply
a b å Intel
a b À AMD
a c 541 U Graphics card
January 16, 2014 6:37:56 PM

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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January 16, 2014 6:40:32 PM

aevm said:
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=N82E168...

R9 280x Crossfire: Sapphire recommends an 1000W PSU. Look under specifications here:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
However, that's ridiculous, I'd go with 850W for this too.

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


I guess It would be smarter to snag another 7950. My mobo is fine for crossfire correct?
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a c 1168 ) Power supply
a b å Intel
a b À AMD
a c 541 U Graphics card
January 16, 2014 6:56:36 PM

intentions said:
aevm said:
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=N82E168...

R9 280x Crossfire: Sapphire recommends an 1000W PSU. Look under specifications here:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
However, that's ridiculous, I'd go with 850W for this too.

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


I guess It would be smarter to snag another 7950. My mobo is fine for crossfire correct?


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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a b ) Power supply
a b å Intel
a b À AMD
a c 143 U Graphics card
January 16, 2014 7:10:08 PM

ko888 said:
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.


I did a bit of research on this. Apparently it will matter a lot in some games, while in others it won't hurt a bit:
http://images.anandtech.com/graphs/graph5458/43817.png

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