750 Watt PSU enough for 2 GTX 970's?

[ali13245]

Hello everyone, I recently ordered a second GPU for my gaming rig, and I just finished installing it, everything is running flawlessly, however I am very concerned about the wattage consumption of these cards.

System Specs:

- Intel Core i7 4790k @stock (turbo boost enabled)
- MSI Z97 Gaming 7 motherbaord
- Crucial Ballistix Tactical Tracer 8GB Ram 2x4GB @1866MHz (OC with XMP on MOBO)
- 2x GTX 970 Windforce G1 Gaming GPU's
- 1TB WD Caviar Blue
- 256GB Crucial MX100 SSD
- Corsair H100i liquid cooler
- Corsair RM750 Watt PSU
- NZXT Hue RGB LED controller
- Fractal Design Define R4 Mid Tower Case

Is my PSU enough for this system?

 

[digitaldoc]

http://www.tomshardware.com/answers/id-2307222/gtx-970-minimum-power-supply-requirement.html

The 750 W PSU was ok with one video card, but not with the two cards. Nvidia recommends 500 W for one card, so 1000 W for the two is pretty reasonable.

 

[17seconds]

Here is Guru3D's power supply recommendation:
•GeForce GTX 970 or 980 - On your average system the card requires you to have a 500 Watt power supply unit.
•GeForce GTX 970 or 980 in 2-way SLI - On your average system the cards require you to have an 800 Watt power supply unit as minimum.

If you are going to overclock your GPU or processor, then we do recommend you purchase something with some more stamina.
http://www.guru3d.com/articles_pages/gigabyte_geforce_gtx_970_g1_gaming_review,7.html

 

[MeteorsRaining]

750W is plenty for SLI 970s, you're good to go.

 

[i7Baby]

http://www.tomshardware.com/answers/id-2307222/gtx-970-minimum-power-supply-requirement.html

The 750 W PSU was ok with one video card, but not with the two cards. Nvidia recommends 500 W for one card, so 1000 W for the two is pretty reasonable.

That doesn't seem to be in the thread you linked to.

 

[jimthenagual]

I'm using a 760W in my system right now with SLI 970s and an overclocked 4790K. It'll depend on what site you look at for recommendations, for example Realhardtecx recommends a 700W (link here). However, if you look at the math by adding up each component's TDP (thermal design power) it comes out to something like this

i7 4790k TDP is 88W
Windforce G1 GTX970 TDP is 191 x2 is 382W
Rest of system 100W

So at 100% load the system will draw 570W. But you never want your PSU running near to that high, so you add 150W or more of overhead. This puts it up to 720W. A 750W PSU is a good size for SLI 970, provided it is of decent quality of course.

Updated for the gigabyte's higher TDP than most. The EVGA is only 145W!