PSU for GTX 770 4GB SLI

Humpernator · May 28, 2015

I've read a lot of posts here taking about the PSU requirements for GTX 770 SLI. Looking to add a second 770 for SLI: Below are my specs

CPU: i7 4770k @ 3.5GHz
Mobo: Asus Z87-Pro
RAM: 2x4 Patriot Viper Extreme 1600MHz
HDDs: WD 1TB 7200 RPM and 250 Samsung EVO SSD
GPU: EVGA GTX 770 SC w/ACX Cooler
PSU: Thermaltake Smart m750W 80 Plus Bronze
Fans: 2x140mm, 3x120mm

As stated I want to add a second identical 770. I'm worried that my PSU isn't up to snuff. I'm debating on going with a higher quality, wattage GPU. Looking for some guidance.

Thanks.

Sapphire Thunder · May 28, 2015

I think you may be better off just upgrading to 900 series. But if that just isn't option, then you need something like 800-900W psu.

But you would gain overally more simply by getting GTX 970. Less power usage but more performance without need for upgrading psu. And you can later add another 970 while still using that 750W psu.

bignastyid · May 28, 2015

I'd suggest a good 850w unit.

Humpernator · May 28, 2015

Sapphire Thunder :

I've debated on doing that as well but I've ran across a solid deal for a second 770. This is why I'm considering it.

Humpernator · May 28, 2015

bignastyid :

Seeing you have SLI 770's I'll take your word for it.

I was even debating on just going up to a 1000w PSU. Would that even be necessary?

galeener · May 28, 2015

You should be good to go with an 850 like an HXI 850.RM850 or above from corsair or any other good manufacturer As long as in the end you arnt going to find another to tri sli

Later on if you do update to the 900 series your all set as they use less power

bignastyid · May 28, 2015

My system(with a bit of oc) will use close to 700w under full load(monitoring with corsairlink). 750w would work but cuts it close which is why I reccomend 850w. 1000w is overkill. I have a 1200w because I was running 3 580s before I got the 770s.

4745454b · May 28, 2015

Bignasty, is that an OC on the cards? Running stock cards with the slight OC on the CPU, I was figuring around 650W. His PSU is ok and I was going to say it's ok. OP, if you'll be running stock without OCing then I stand by that. You should be alright. If you want to OC stuff however then you'll need more.

http://www.techpowerup.com/reviews/Thermaltake/Smart_M_750W/10.html

bignastyid · May 28, 2015

4745454b :

Cpu and gpus oc'd. 4.3Ghz on the cpu and Gpus at 1250/7050.

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