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750W PSU Enough for GTX 770 SLI?

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  • Power Supplies
  • Graphics Cards
  • Components
  • Nvidia
Last response: in Components
July 15, 2014 12:37:19 PM

Hi everyone, I have a simple question concerning my current power supply. I'm planning to buy another EVGA GTX 770 4GB FTW with ACX cooler in maybe a year, less or more, and I wonder if my power supply would be able to support my rig:

I actually have:
Mobo: Asus Sabertooth 990FX R2.0
PSU: Corsair TX 750M Modular PSU 750W
CPU: AMD FX-8350 @4.3GHz but planning on OC'ing it to 4.5 later
CPU aftermarket cooler: CoolerMaster Hyper 212 EVO
RAM: 2x4GB 1600MHz Kingston HyperX memory sticks
Graphic Card: EVGA GTX 770 4GB Dual FTW with ACX Cooler
HDDs: WD 1TB Caviar Black 7200 RPM HDD and WD 2TB Caviar Green 5400 RPM HDD
Monitor: 21.5" Asus LED Monitor (I don't know its name but well)
Case: NZXT Phantom 530 Black
Fans: 1x200mm fan, 1x140mm fan, 3x120mm LED fans
Mouse: Anker 8200 DPI Mouse
Keyboard: Old mechanical keyboard.. meh

So yeah I'm planning to add another GTX 770 to SLI the two, overclock my CPU to 4.5GHz, probably get another HDD or get an SSD and maybe get a new keyboard with macros, LED and things. Would my power supply support my "future" rig? If not, which one should I get? Thanks.

More about : 750w psu gtx 770 sli

a b ) Power supply
a b U Graphics card
a b Î Nvidia
July 15, 2014 12:42:00 PM

I think not. The GTX 770 support page lists the requirements as "600W for the system and 230W for the GPU"

http://www.geforce.com/hardware/desktop-gpus/geforce-gt...

So add another 230W for the second 770 and you're at 830W recommended. Plus you need to make sure you have enough power connectors on your PSU.
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a c 154 ) Power supply
a c 196 U Graphics card
a b Î Nvidia
July 15, 2014 12:42:55 PM

Yes; your PSU will be fine for it. But if you are overclocking your CPU to 4.5 GHz, then I would advice you to not overclock the graphics cards. While your PSU will run them at stock, you can easily waste your headroom with too much overclocking.
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a b ) Power supply
a b U Graphics card
a b Î Nvidia
July 15, 2014 12:45:54 PM

That's really, really tight. Do the back of the envelope math.

The CPU uses 125W
2 x 770s uses 460W

that's 585W right there. Did you want to drive some fans, the mobo might take a few w and the hard drives as well. :D 
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July 15, 2014 12:46:04 PM

Thanks for answers guys and ksham: My current GTX 770 is factory overclocked already, so if I buy another one, I'll buy the same model. So what would you guys recommend me?
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Best solution

a b ) Power supply
a b U Graphics card
a b Î Nvidia
July 15, 2014 12:52:12 PM

Just read the specs for your GPU and it's actually rated to use 250W - that's a whole 20W over the stock model.

http://www.evga.com/Products/Product.aspx?pn=04G-P4-377...

I'd not even try to run two of those with less than 850W and more likely more since I don't like to tax my PSUs.

Consider one from this list.
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July 15, 2014 12:57:48 PM

Alright, thanks guys. And Karsten, the PSUs you mentioned look pretty good for their price, thank you.
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a c 154 ) Power supply
a c 196 U Graphics card
a b Î Nvidia
July 15, 2014 12:58:05 PM

Dapunisher6666 said:
Thanks for answers guys and ksham: My current GTX 770 is factory overclocked already, so if I buy another one, I'll buy the same model. So what would you guys recommend me?

You should be fine. As for SLI, I recommend the second card to be a blower-type one instead of the ACX Cooler. And put this second card in the first slot. ACX Cooler is great, but if you put an ACX card on top of another one, it's less efficient because it'll just be sucking in hot air from the bottom card.
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July 15, 2014 1:08:29 PM

ksham said:
Dapunisher6666 said:
Thanks for answers guys and ksham: My current GTX 770 is factory overclocked already, so if I buy another one, I'll buy the same model. So what would you guys recommend me?

You should be fine. As for SLI, I recommend the second card to be a blower-type one instead of the ACX Cooler. And put this second card in the first slot. ACX Cooler is great, but if you put an ACX card on top of another one, it's less efficient because it'll just be sucking in hot air from the bottom card.


I don't think they even sell GTX 770 4GB FTW without the ACX cooler though x) If you look up on EVGA's website, can't find one without ACX.
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a c 154 ) Power supply
a c 196 U Graphics card
a b Î Nvidia
July 15, 2014 1:20:01 PM

Yeah; you're right. Oh well... :p 

Not the ideal setup but not the end of the world.
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