Is corsair RM750 enough for 780 SLI ?

[queb]

I'm about to making a new build, but i was wondering whether i need a 750w or 850 for gtx 780 SLI

 

 

my rig:

 

 

Mobo: MSI Z87-G45

Cpu: Intel i5 4670k @4.2 ghz planing 4,4/5

Gpu: Geforce (Brand unknow atm) 780 SLI

Psu: Corsair RM series 750 or 850

Ssd: Samsung Evo 250gb

Case: NZXT H440 (When it comes)

 

 

[Guest]

I recommend going with the RM850 just to be sure.

[Rorgash]

i recommend going with 750, going high above just lowers the efficiency of the PSU 

[TheDigitalRealm]

I recommend going with the RM850 just to be sure.

He doesn't need 850W for that set up. If he was running a 4930K or something, plus a water cooling loop, then maybe. 

[Prokart2000]

a psu calulator with 4.4ghz at 1.35v with 780 sli got 713w

[SeanAngelo]

a 750watt is fine

[jezza39]

3960X @4.6GHz/1.4V + SLI GTX 780 peaked at 544W from wall (about ~500W after 92% efficiency) during a furmark load. 750 W is more than enough

 

http://www.guru3d.com/articles_pages/geforce_gtx_780_sli_review,4.html

Edit: Link

[Izaya Orihara]

Yes it is. Tiny Tom made a video running a oced i5 and a 780ti on an RM 450 Watt. 

[queb]

Thanks for the fast replies, glad i can stick with the 750

costs me about 50 bucks in Denmark if i go with the 850 over 750

[Izaya Orihara]

i recommend going with 750, going high above just lowers the efficiency of the PSU 

I recommend staying with the 750 one two but this is wrong. A PSU's efficiency is typcial at it's highestt around 50% load a stressed out 780 sli will pull 650-700 Watts. That is more like 90% load. 

[VSG]

Yes it is. Tiny Tom made a video running a oced i5 and a 780ti on an RM 450 Watt.

Big difference in that he didn't overclock both at the same time, didn't overvolt the GPU and the 780s can go to a minimum of 1.3v compared to the 1.212V for most 780Ti cards.

[Lays]

snip

 

It's all dependant on what he wants to do, if he never plans on overvolting+ benchmarks, he'll be fine.  2 780's can easily take 700+ once you get into 1.3v+ territory, such as @VSG mentioned.

[Izaya Orihara]

Big difference in that he didn't overclock both at the same time, didn't overvolt the GPU and the 780s can go to a minimum of 1.3v compared to the 1.212V for most 780Ti cards.

I know that your kingpins are more power hungry than that. I know also the Windforcfe 780 comes  oced out of the box pretty high. 

[PingPangbv]

You probably won't need more than the RM750. I'm running a 3930k @4,6GHz and 2 x GTX 780 and while folding I'm drawing about 800W from the wall. But then again the system isn't really drawing 800W as the PSU is sucking up  11% of that power.

[VSG]

I know that your kingpins are more power hungry than that. I know also the Windforcfe 780 comes  oced out of the box pretty high. 

 

Ya the Classified cards can go much higher on voltages than any other 780Ti without needing any hard mods.

[jezza39]

It's all dependant on what he wants to do, if he never plans on overvolting+ benchmarks, he'll be fine.  2 780's can easily take 700+ once you get into 1.3v+ territory, such as @VSG mentioned.

 

Less than .001% of people plan on doing that, if they are, they'll know what PSU they need. We don't need to recommend 1000W PSUs for every SLI configuration. A 4670K @ 4.2GHz-4.5 like OP is interested in isn't exactly a benchmarking style rig