is 750w enough for sli 970's

NotSponge · 23 Dec 2014 at 01:07

I Have looked around at the different tools for calculating total system power use, the psu will be a evga gold 750w supernova g2 ( http://www.overclockers.co.uk/showproduct.php?prodid=CA-012-EA ) and the gpus will be twin gtx 970's from gigabyte, the g1 variant, they will go along with an i7-4790k and I'd like to do some overclocking on both gpus and the cpu

Thanks

FredFlint · 23 Dec 2014 at 01:20

I would go with an 850W to be safe but the G2 is a good PSU so it should be ok.

Threepwood · 23 Dec 2014 at 01:27

That 750w PSU will be plenty for sli 970's.

Audigex · 23 Dec 2014 at 01:30

Easily

At load a single-970 system with an i7-4960X @ 4.2GHz (hungrier than your 4790) will draw around 300W from the socket.

Reference:
http://www.anandtech.com/show/8568/the-geforce-gtx-970-review-feat-evga/15

Even if we assume that the 970 draws ALL of that, and that the PSU is 100% efficient (PSU's are measured in output, not what they pull from the socket) you'd be just about safe with 600W. 750W would give you 25% extra over that for accessories, extra disk drives and a decent chunk of capacitor degradation

In reality, an i7/SLI 970 system will draw significantly less than 600W from the wall, and even with heavy overclocking and excellent cooling (as the 970 seems to be TDP limited in most overclocks) you're well within a safe margin with a 750W. Unless you went crazy with the overclocks, I'd be comfortable with 650W for an SLI970 setup.

NotSponge · 23 Dec 2014 at 01:34

Thanks for quick replies, I heard it would be enough but I wanted peace of mind

Thanks again guys

wellibob · 23 Dec 2014 at 03:48

Yes yes yes. 750 more than plenty and my gear is overclocked as much as possible

enapace · 23 Dec 2014 at 06:30

Yeah more than fine that is the PSU I'm getting for my 4790K and 970 SLI build.

P4Clock · 23 Dec 2014 at 14:33

970 can run on a 600w there very low power

abui1806 · 24 Dec 2014 at 13:09

Yeah you should be fine. I used a XFX 850w black edition (OEM by seasonic) with CF GTX 970 HOF and i7 5820K @ 4.5Ghz without any problem. The only reason made me buy another superflower 1000w platinum was because of the white colour scheme.

Longbow · 28 Dec 2014 at 16:02

Audigex said:
Easily

At load a single-970 system with an i7-4960X @ 4.2GHz (hungrier than your 4790) will draw around 300W from the socket.

Reference:
http://www.anandtech.com/show/8568/the-geforce-gtx-970-review-feat-evga/15

I thought that was for the card only, not including CPU etc?

pastymuncher · 28 Dec 2014 at 18:38

It clearly says total system power in the headers above the graphs. Most review sites show total system power these days with the exception of Guru3d who like to break the gpu power down. The 970's are extremely power efficient.

Longbow · 28 Dec 2014 at 19:35

pastymuncher said:
It clearly says total system power in the headers above the graphs.

You're right it does, I missed that.