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Question about SLI & Power Supply.

Last response: in Graphics & Displays
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June 6, 2012 1:14:26 PM

Hey all.

I am currently in the process of buying parts towards my first PC build. I am going to buy the graphics card last as it is the most expensive.

I plan on getting a GTX 670 but if I cannot afford it when it comes to it, I will go with a GTX 570.

Obviously a 650W Power Supply will be enough to support either of these cards by themselves.

If I go with the GTX 670, there will probably never be any need to use SLI as my goal is to run Battlefield 3 maxed smoothly and one GTX 670 should do this easily.

However, if I cannot afford a GTX 670, I will buy a GTX 570 with plans to buy another one and SLI later on.

My questions are:

Will a 650W Power Supply be enough to support 2 GTX 570's?

Is it worth paying $200 more for a GTX 670 over a GTX 570?

If I do happen to buy a GTX 670, and do happen to ever want to buy 2 and SLI, how big of a Power Supply will I need?

I hope this post made sense, thank-you.
a b U Graphics card
a b ) Power supply
June 6, 2012 1:22:32 PM

according to guru3d a single gtx 570 takes about 361W. Add in the 220W for the second card, and you are at 581W, or around 600W. You need 600W to run the setup, but seeing as no one runs right at the limit of their PSU you should add some more. I think a high quality 750W is what you need to be safe.

In case of gtx 670 sli, however, your 650w is quite more than enough, provided its a quality psu. gtx 670sli would take about 140w less than the gtx 570sli.
June 6, 2012 1:27:30 PM

shamsmu said:
according to guru3d a single gtx 570 takes about 361W. Add in the 220W for the second card, and you are at 581W, or around 600W. You need 600W to run the setup, but seeing as no one runs right at the limit of their PSU you should add some more. I think the high quality 750W is what you need to be safe.

In case of gtx 670 sli, however, your 650w is quite more than enough, provided its a quality psu. gtx 670 would take about 140w less than the gtx 570.


I'm not sure what brand of PSU I am going to go with yet but it will be something that is Bronze certified.

Thanks for doing the math, a 650W should be plenty for 2 570 GTX's then and obviously enough for one GTX 670.

I figure that by the time games need 2 GTX 670's to run, it will be time to upgrade my graphics card anyway.
Maybe I will buy a second one when they are cheap in 6 months time. Will a 750W PSU be enough for 2 GTX 670's?
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a b U Graphics card
a b ) Power supply
June 6, 2012 1:33:21 PM

I'd say you need 750w for the gtx570 sli, 650w may cause your system to fail its too risky to try.

and 650w for the gtx670 sli.

a corsair tx750 is a cheap, reliable bronze plus solution.

670sli consumes a lot less power. But if I were to suggest, get a single gtx 670. You won't regret it. I just got mine today and its AMAZING!! runs bf3 ultra maxed smooth as a cupcake. fps generally 60+, a few rare exceptions but 53 is as low as it gets. Also most of the time fps stays 80-129.
June 6, 2012 1:41:17 PM

shamsmu said:
I'd say you need 750w for the gtx570 sli, 650w may cause your system to fail its too risky to try.

and 650w for the gtx670 sli.

a corsair tx750 is a cheap, reliable bronze plus solution.

670sli consumes a lot less power. But if I were to suggest, get a single gtx 670. You won't regret it. I just got mine today and its AMAZING!! runs bf3 ultra maxed smooth as a cupcake. fps generally 60+, a few rare exceptions but 53 is as low as it gets. Also most of the time fps stays 80-129.


Thanks for the info.

Sorry I understand now, the GTX 670 requires less power to run than the GTX 570. That's awesome man, the whole reason I'm building this rig is to run Battlefield 3 maxed. 80 FPS are you serious? I was only expecting 60 out of the GTX 670.

What resolution are you playing on? I am going to be playing at 1080 on a 23" screen. I think you have me convinced to suck it up and buy one GTX 670, it sounds amazing.

Also thank-you for recommending on the Corsair TX750. I just checked and my local shop has it in stock for $150 and the TX 650 for $125. I don't think I can go wrong with either.
a b U Graphics card
a b ) Power supply
June 6, 2012 2:18:20 PM

steve695 said:
Thanks for the info.

Sorry I understand now, the GTX 670 requires less power to run than the GTX 570. That's awesome man, the whole reason I'm building this rig is to run Battlefield 3 maxed. 80 FPS are you serious? I was only expecting 60 out of the GTX 670.

What resolution are you playing on? I am going to be playing at 1080 on a 23" screen. I think you have me convinced to suck it up and buy one GTX 670, it sounds amazing.

Also thank-you for recommending on the Corsair TX750. I just checked and my local shop has it in stock for $150 and the TX 650 for $125. I don't think I can go wrong with either.


yeah same as yours 1080p 23'' 120hz
June 6, 2012 11:45:25 PM

That's awesome. I will have to go with a GTX 670 then.
!