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Advice on PSU for Xfire

post #1 of 17
Thread Starter 
I recently bought a second 7970 and am wrapping up my recent build. I've been looking at power supplies and have come up with my choice: EVGA's 1000w Supernova G2. Seems like good deal considering EVGA's reputation and the amazing 10 yr. warranty. I've used XFX and Seasonic in the past and have been happy with them. This just seems like a really good deal from a good company. Looking for any advice or criticism on this choice.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817438010
    
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post #2 of 17
The EVGA SuperNOVA G2 is based on Super Flower's new "Leadex" platform, which got a glowing review at JonnyGURU.

It's an excellent GPU, but 1000w is a bit overkill for two 7970s. You could easily get by with a 750-850 watt unit.
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post #3 of 17
Hey HotRod717

The PSU you are looking for is a little overkill for CrossFire 7970 but it is a pretty good power supply. It is also fully modular and comes with sleeved cables. You could also run 3 x HD 7970s with it (MidOC)

It is also part of the FAQ: Recommend Power Supplies list.

You should buy it if you have the money but you can get cheaper PSUs if you want.
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post #4 of 17
It's certainly enough power for a couple of 1300MHz 7970s if yours can clock that high. And that 10 year warranty sounds nice.

The price is right too. Looks like you should get it!

Keep in mind that since you are running a 3770k, all you'd ever need is a 850w with a couple high clocking 7970s.
    
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post #5 of 17
Thread Starter 
Really? I have a Seasonic X 750, however it is powering 2 D5's, a fan controller, 9 fans(soon to be 15) and I oc my gpu's and cpu. Still think it will be enough?
    
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post #6 of 17
Quote:
Originally Posted by hotrod717 View Post

Really? I have a Seasonic X 750, however it is powering 2 D5's, a fan controller, 9 fans(soon to be 15) and I oc my gpu's and cpu. Still think it will be enough?

Depending on the volts and overclock of a couple of 7970s and 3770k, an X750 will do great.
    
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post #7 of 17
You would be fine with your X 750 but if you want to OC, I recommend around 850w. Thats why the SuperNova is a good candidate for high OC and if you want to add a third HD 7970 down the road with Mid OC.


SOURCE

Quote:
Above, a chart of relative power consumption. Again the Wattage shown is the card with the GPU(s) stressed 100%, showing only the peak GPU power draw, not the power consumption of the entire PC and not the average gaming power consumption.

Here is Guru3D's power supply recommendation:

  • Radeon HD 7970 - On your average system the card requires you to have a 550 Watt power supply unit.
  • Radeon HD 7970 Crossfire - On your average system the cards require you to have a 750 Watt power supply unit as minimum.
  • If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.


There are many good PSUs out there, please do have a look at our many PSU reviews as we have loads of recommended PSUs for you to check out in there. What would happen if your PSU can't cope with the load:

  • bad 3D performance
  • crashing games
  • spontaneous reset or imminent shutdown of the PC
  • freezing during gameplay
  • PSU overload can cause it to break down

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WaterCool MoRA3 Pro with Gentle Typhoon 3 x MCP 655 pumps (With EK top...all serial) 2 x EK FC 1080ti Blocks Windows 7 Ultimate x64 
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post #8 of 17
Thread Starter 
Well, All this is dependent on the card. I can wait till it gets here and see how it does. 24/7 OC on the gpu would be 1.285. I keep it mild at 1100/1600. But benching 1.4+ and the cpu is only at 1.28v. I do have a few old psu's and could use one of them for my watercooling stuff until I bought the EVGA. Just hope the price stays nice if I do need it down the road! Thanks for all the help guys. Looking to wrap this build up in the next several weeks.
    
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post #9 of 17
here is an amazing deal also. Fully modular and great reviews!

http://www.newegg.com/Product/Product.aspx?Item=N82E16817341044


In all honesty that 750 will be enough. Its a great power supply. Try everything it out and if it cant handle it then grab a new psu.
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post #10 of 17
Quote:
Originally Posted by Quesoblanco View Post

here is an amazing deal also. Fully modular and great reviews!

http://www.newegg.com/Product/Product.aspx?Item=N82E16817341044

That OCZ ZX 850w isn't that great. Great Wall is the OEM, the primary capacitors are from CrapXon CapXon, with the secondaries from Cheapo Teapo. The 12v rail's regulation is middling as well.

In short, I wouldn't willingly put that model into OP's build.
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Julia
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