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Is 1000w psu enough for 2 5970s in crossfire?

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  • Power Supplies
  • Crossfire
  • Components
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Last response: in Components
December 8, 2011 5:18:05 PM

I'm building a gaming pc and I need to know if a 1000w psu will be enough

I'm going to get the Asus P8z68 Deluxe mobo. Core i7 2600k for CPU and of course the two 5970s.

I also need a good case that will be long enough as well

More about : 1000w psu 5970s crossfire

a b ) Power supply
December 8, 2011 5:45:13 PM

A 1000 W PSU will be enough for a pair of 5970s, but you should consider a 1200 W unit. At anything approaching full load the PSU will show signs of stress ans may be loud.
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a c 877 ) Power supply
December 8, 2011 5:48:05 PM

Has to be a quality unit!
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December 8, 2011 5:54:00 PM

I was just looking at 1200w PSUs and they seem quite expensive :( 
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a c 87 ) Power supply
December 8, 2011 5:59:04 PM

http://www.techpowerup.com/reviews/ASUS/EAH5970/29.html
According to that 5970s use 304W under maximum load. x2 is 608W. Then you have to add the rest of the system to that to know what your likely maximum power consumption will be.
But you definitely won't be overloading a 1000W PSU. The only question remains whether you feel comfortable stressing your PSU to the level that you will be doing.
If it is a high quality unit then you shouldn't necessarily be uncomfortable because a high quality unit can deliver its stated wattage all day.

Of course it depends on the PSU, do you already have it? If so what is the model name? If not then what is your budget and where are you buying from?

Do you have a budget for the case?
Listing some of your preferences for a case (besides fitting 5970s and other obvious things like 'good airflow') would be helpful in choosing some to recommend.
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a c 1665 ) Power supply
December 8, 2011 6:02:06 PM

For a system using two Radeon HD 5970 graphics cards in 2-way CrossFireX mode a minimum of an 850 Watt or greater power supply that has a combined +12 Volt continuous current rating of 70 Amps or greater and that has at least two 6-pin and two 8-pin PCI-Express supplementary power connectors is recommended.

It's not the wattage of the power supply that you should be looking at. The only critical power supply specification is the power supply unit's combined +12 Volt continuous current rating. Just make sure its combined +12 Volt continuous current rating is 70 Amps or greater and you'll have enough.

A decent 1000 Watt power supply will have a combined +12 Volt continuous current rating of at least 80 Amps.
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December 8, 2011 6:14:01 PM

Maybe something like this. http://www.newegg.com/Product/Product.aspx?Item=N82E168....

I've never needed a psu this high so I diddnt expect to spend that much

For the case, price isn't an issue but it should still be reasonable. I wanted something that's looks cool as well and not just a big black box
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a c 311 ) Power supply
December 8, 2011 9:58:57 PM

I wouldn't let a single 5970 near any of those units except the higher wattage Silent Pro Gold units, most of cooler masters other units are moderate to extremely crappy. You are talking about powering two very expensive cards, get a good PSU, it will last about twice as long as those cards will.
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December 8, 2011 11:09:22 PM

Hmm I'll probably get that ocz 1000w one. I still need to find a case though.
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December 9, 2011 12:12:31 PM

The problems I've been reading about that psu is that it gets very noisy and the cables are not long enough for a full tower case and/or a case with a bottom mounted psu. The price is pretty good though so I'll have to do a little more searching to see if it's worth it.
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December 9, 2011 8:22:29 PM

Yea but I think that's an older version, it's $20 cheaper. The red shouldn't be a problem. The psu is real problem.
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December 9, 2011 8:50:11 PM

I don't think theres any that beat the price though. Do you think it's worth it?
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a c 1665 ) Power supply
December 9, 2011 8:56:59 PM

The wall outlet that you're planning to plug this 1600 Watt power supply into has a circuit breaker with what amperage rating?
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December 9, 2011 9:03:56 PM

I really have no idea. I was going to plug it into a surge protector thing. I dont need the full 1600w
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