PSU Recommendation for GTX 780Ti SLI

Cali92 · Jun 3, 2014

Hey guys, just looking for some advice regarding whether or not my PSU will be sufficient to run 2x GTX 780Ti's in SLI. My current PSU is a Corsair AX860 which is only running 1 card at the moment. I plan on buying my second card within the next couple of weeks.

The rest of my setup is as follows:

Case: Define R4
Case Fans: 3x Noctua NF-A14 PWM fans
PSU: Corsair AX860
Motherboard: Asus Maximus VI Hero
CPU: i7 4700k @ 3.5Ghz (Stock)
CPU Cooler: Noctua NH-U12s
RAM: Corsair 16GB DDR3 1866MHz Dominator Platinum
SSD: 512GB Samsung 840 Pro
Graphics Card: Asus GTX 780Ti Direct CUII

When I buy my second GTX 780Ti, I also plan on adding a hard drive, which will be a 2TB Western Digital Caviar Black. I will also probably OC my i7 4700k to 4.2Ghz soon.

According to several review websites, 800W is the minimum for GTX 780Ti SLI. However, after researching online, there are a lot of mixed opinions.

- Do I need more headroom or will the AX860 be sufficient after I add another card and a hard drive?
- Should I swap it for a 1000W PSU? e.g SuperFlower Leader Platinum 1000W

Thanks for your time and I look forward to hearing your feedback.

MagicPants · Jun 3, 2014

The ax860 is a very highend 860watter, so I don't think you're going to have a problem.

i7Baby · Jun 3, 2014

600W minimum. Something good per - http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html#13224310 eg Seasonic 620, Antec HCG 620M, XFX 650

The AX is fine - just bigger than you need.

InvalidError · Jun 3, 2014

i7Baby :

For a pair of 780Ti, 600W roughly covers the budget for the GPUs alone and you still need to add ~100W for everything else, which brings the peak total to somewhere in the neighborhood of 700W.

Since OP says he wants to overclock on top of that, the AX860 could start feeling a little tight.

i7Baby · Jun 3, 2014

My bad - didn't see the SLI.

You need 950W, so get an AX1200

bignastyid · Jun 3, 2014

The AX860 will handle that even with overclocking.

Cali92 · Jun 3, 2014

Hi guys, thanks for your replies. Just a quick update with some info. The CPU will be overclocked to 4.2Ghz, with the GTX 780Ti's left at stock. I'm currently using a BenQ 144Hz monitor (1080p). However, I will be switching to the 1440p 144Hz when the Asus RoG Swift is released in July.

How much headroom will I have if I stick with the AX860? 50W? 100W? Is this enough?

Karadjgne · Jun 3, 2014

Since the monitor is plugged into the wall, its not going to affect the gpu in any way. The 1440 will still be under your Gpu's ceiling so you'll be good.

bignastyid · Jun 3, 2014

I'd say your system OC'd would max at ~700-750w. On a lesser quality PSU I'd probably suggest replacing it. But the AX860 is a top tier unit and should be more than capable of handling the load.

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PSU Recommendation for GTX 780Ti SLI

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