Will 750 Watts be enough to SLI and overclock 2 GTX 1080's in SLI and an i5 4690k CPU?

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Elf_Knight

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Nov 9, 2013
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I have an i5 4690k CPU and 8 gigs of ram. Might get more later. I will get a new mobo for OC'ing and SLI. Want to SLI 2 GTX 1080's for 4k gaming. I'll get 1 now and a second later on. I want to upgrade my PSU from 500 watts EVGA so I want to know if I should straight away get an 850 watt PSU. I currently have a gtx 970 that I want to overclock so it will be useful for that too. What should I get though? Is 750 watts enough or should I get 850? Can't afford more then that and was thinking to get the 750 watt EVGA Platinum Fully Modular PSU. Cheers!
 
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10tacle
I run a 4690K with two overclocked 970s in SLI just fine on a Corsair 750W. My CPU is overclocked to 4.7GHz with an NH-D14 cooler and a case with 5 fans as well as two HDDs, one SSD, and two DVD/BD media players.

The platinum PSU rating just means it is more efficient at higher loads, or the closer you get to maxing out that 750W use. You could spend $20 more and get EVGA's 850W G2 (gold efficiency rating). Reference 1080s in SLI use ~365 watts on their own (compared to reference 970s in SLI at 336W), and partner cards from the likes of EVGA, MSI, and Gigabyte with dual or triple fans consume more than that.

You should be fine with a 750W platinum P2 from EVGA, but I'd go 850W if I had to upgrade from a 500W PSU. If you have to...
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wez360

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No espcially if you are planing to overclock that will defo not be enough, the founder's card pull close to 400w when oc so a 850w will be no good either, you will have to go for a 1200w psu to run 2 gtx 1080s in oc, if you can buy 2 gtx 1080s then you can buy a decent psu to power them
 
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10tacle

10tacle

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I run a 4690K with two overclocked 970s in SLI just fine on a Corsair 750W. My CPU is overclocked to 4.7GHz with an NH-D14 cooler and a case with 5 fans as well as two HDDs, one SSD, and two DVD/BD media players.

The platinum PSU rating just means it is more efficient at higher loads, or the closer you get to maxing out that 750W use. You could spend $20 more and get EVGA's 850W G2 (gold efficiency rating). Reference 1080s in SLI use ~365 watts on their own (compared to reference 970s in SLI at 336W), and partner cards from the likes of EVGA, MSI, and Gigabyte with dual or triple fans consume more than that.

You should be fine with a 750W platinum P2 from EVGA, but I'd go 850W if I had to upgrade from a 500W PSU. If you have to upgrade anyway, make it worthwhile.

 
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wez360

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One of the links Jedi posted recomends 500w for just one card and the other one recomends 750w for 2cards but like I said if you are planning on oc them 850w will not be enough and the 1080 is not a 150w card
 
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Donlogan85

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As long as you have a 750w gold or platinum power supply you will be ok. Running both of them OC on that system will draw around 650 to 700w. To be sure i would advise a jump to 850w but 1200w is just insane. Those are designed for 3 way sli and even 4way sli with fully liquid cooling and the whole kit.
 
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10tacle

10tacle

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^^Yeah that other guy commenting that the Founder's edition card pulling close to 400W is reading a benchmark that included the total PC power consumption including the card.

Many people get confused on details like that in power measurements of cards, which is why usually the site doing the benching describes *exactly* how and what they are taking measurements of.
 
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Elf_Knight

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Thanks guys! I will start off with one non-overclocked GTX 1080 on my 500 watt PSU until I save up for a second card. I will get an 850 watt PSU to power my rig and ensure that it is Platinum quality for best efficiency. Is EVGA better then Corsair for PSU's? I have used EVGA and it is a good quality PSU. Lasted me for over a year on demanding gameplay. I do not see myself doing custom water cooling because the 1080 cards are very well cooled especially with the Board partner versions. Also I have an AIO liquid cooler for my CPU so I am covered. Might wack on some AIO's on the 1080's if they make custom brackets for them later but I will use stock cooling for now. I think 850 watts should be enough for all my needs. Thank you very much everyone for your help so far!
 
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Elf_Knight

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I am looking at 3 power supplies. Two are from Corsair. One is semi-modular and the other is fully modular both 850 watts. One is a Platinum Supernova Fully Modular PSU from EVGA. I want to get the last PSU from EVGA. Would that be a good choice? Cheers!
 
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10tacle

10tacle

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What series models are you looking at specifically?
 
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