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How much power should i use for a dual GTX 770 setup?

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July 3, 2014 2:15:35 AM

I have a CX750 power supply from Corsair. But i am wondering if it is enough to power 2 GTX 770 and an i7-4770K. I am currently running with a single 770. I know the costs of using SLi. I do not have any overclock yet.
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July 3, 2014 2:22:01 AM

it is enough, although this one is only 80 bronze, so probably not a good way to go
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July 3, 2014 2:22:53 AM

chrvontab said:
I have a CX750 power supply from Corsair. But i am wondering if it is enough to power 2 GTX 770 and an i7-4770K. I am currently running with a single 770. I know the costs of using SLi. I do not have any overclock yet.


I think it will be just enough but if you could get a bigger that would probally best,
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July 3, 2014 2:24:44 AM

750w is enough, however if you can get rid of that power supply please do and get a newer better one... the CX series is just bad. Even though 750w is enough the power supply is bad quality, replace it if you can i wouldnt trust it with a sli gtx and a i7 system
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July 3, 2014 4:21:57 AM

GTX 770 sli peak 505w/42amps , 700-800w PSU recommended.
http://www.guru3d.com/articles_pages/geforce_gtx_770_sl...

It's fine as long as your not over-clocking heavily or using power hungry 770 variants. The CX series may not be the best which is why people look down their nose at them. But they are better than some Aerocool or Diablotek junk. If you want to upgrade it for peace of mind, that's an option.


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July 3, 2014 5:46:47 AM

its not that the CX series is not good, its the fact that they're just bad. Sure its better than some random 'no-brand' junk, but thats like saying a table made out of cardboard is better than one made out of paper, they're both bad all the same. The CX series form corsair is tier 3 , in other words its moot, not meant for serious systems, and especially not one with an sli configuration and an i7....the different loads on the different rails (especially with 2 gpus) will absolutely destroy the psu in its crossload performance, on the other hand a slightly higher priced XFX pro series power supply with a single '12v' rail will fare ALOT better, with special emphasis on the 'ALOT' The XFX is a high tier 2 power supply AND is made by seasonic themselves, the CX will fail under heavy loads and high temperatures (an example being running 2 gtx 770s with an i7 and possibly some overclocking' . I would really not recommend the OP to run a sli system on a CX power supply, you might not see anything wrong now, but your current psu will reduce the life of your components and honestly speaking, the last thing you want is a $1000 system being slowly suffocated...
This is a very very good XFX power supply http://pcpartpicker.com/part/xfx-power-supply-p1750bnlg...

Here is a review of a CX unit http://www.techpowerup.com/reviews/Corsair/CX600M/5.htm... , the voltage regulation on the 12v rail is about 2.34% , that is absolutely pathetic
here is a review of an XFX pro http://www.hardwaresecrets.com/article/XFX-PRO-750-W-Po...

if you dont want to see what magic smoke smells like, i would highly recommend to change the power supply before adding in the second gtx 770

EDIT: i'm not implying that the CX is sure to fail, but why risk your whole system? .... if you can afford it, i would highly recommend the XFX unit i mentioned
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