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3x GTX 780's - how well will they scale?

Gauzl
By Gauzl
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At 2560x1440p on something like crysis 3, which at the moment my 2 780's are at over 90% usage, how much usage would I get out of a 3rd?

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Unless you've got money to burn, it's not worth it. After 2 cards, the performance gained by adding another is pretty small. 

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At 2560x1440p on something like crysis 3, which at the moment my 2 780's are at over 90% usage, how much usage would I get out of a 3rd?

 

You might get about half the performance boost you got when adding in a second card

 

So you would still benefit, but it might not be worth it

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At 2560x1440p on something like crysis 3, which at the moment my 2 780's are at over 90% usage, how much usage would I get out of a 3rd?

 

SLI-Scaling drastically degrades with every GPU added. I'd never recommend a threeway-SLI setup to anyone - the price-power-ratio just sucks. IF you've got the money laying around you could go for it and see a slight performance boost, but it wouldn't be worthwile spending the money imho. Treat yourself with a other upgrade to enhance your gaming experience: You'll get more for your money guaranteed.

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Since when usage matters?

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GK110's scale incredibly well. anyone who still thinks gpu scaling sucks these days is living in the past

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Since when usage matters?

ikr thats what i  was thinking lol

 

 

-

op sell ur 780's and get a r9 295x2 or something lol

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[ I5 4690k (no oc) - Gigabyte Z97 D3H - 8GB Ram - Sapphire R9 280X Vapor-X ]

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Since when usage matters?

 

It doesn't really matter but it gives you an idea of how well SLI scales. In 2 way SLI only 90% of both GPUs are used. If he switches to three way SLI this percentage will drastically go down which indicates that the scaling doesn'T work very well - the GPUs aren't working to capacity.

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GK110's scale incredibly well. anyone who still thinks gpu scaling sucks these days is living in the past

That's not right. I'll refer you to this EVGA forum thread where someone benchmarked scaling. Up to 2 way SLI it's fine, above that it begins to suck.

http://forums.evga.com/GTX-780Ti-Benchmarks-1x4x-SLI-Work-in-Progress-m2069079.aspx

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maybe if people used google they'd realise its not 2006 anymore, scaling with sli and crossfire is pretty good these days. (0-100%) it depends on the game
http://www.guru3d.com/articles-pages/geforce-gtx-780-sli-review,22.html
http://www.tweaktown.com/tweakipedia/38/nvidia-geforce-gtx-780-sli-benchmarked-at-4k/index.html

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maybe if people used google they'd realise its not 2006 anymore, scaling with sli and crossfire is pretty good these days. it depends on the game

http://www.guru3d.com/articles-pages/geforce-gtx-780-sli-review,22.html

 

Yeah scaling is good these days, but you get less adding a third card, as you originally got adding the second card, and for games where scaling is bad you are getting nothing

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maybe if people used google they'd realise its not 2006 anymore, scaling with sli and crossfire is pretty good these days. (0-100%) it depends on the game

http://www.guru3d.com/articles-pages/geforce-gtx-780-sli-review,22.html

http://www.tweaktown.com/tweakipedia/38/nvidia-geforce-gtx-780-sli-benchmarked-at-4k/index.html

 

You're quoting this article in a thread where the topic is three-way-SLI? Sorry, but you're undermining your own argument: Nearly every graph in this article shows that 3-way SLI doesn't scale very good. I agree with you on 2-way-SLI (I'm running one my self) but three-way SLI isn't quite ready yet.

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You might get about half the performance boost you got when adding in a second card

 

So you would still benefit, but it might not be worth it

Half the performance of two cards?

The most common result of insufficient wattage is a paperweight that looks like a PC

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Half the performance of two cards?

 

No the 3rd card will only add half as much performance that adding the second card did

 

So 1 card is 100%.. 2 cards is 150% 3 cards is 175%, so that 3rd card only added 25% not 50% like the second.

 

(does that make sense obviously those % are made up)

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No the 3rd card will only add half as much performance that adding the second card did

 

So 1 card is 100%.. 2 cards is 150% 3 cards is 175%, so that 3rd card only added 25% not 50% like the second.

 

(does that make sense obviously those % are made up)

So it only adds approx. 50% performance of 1 card?

The most common result of insufficient wattage is a paperweight that looks like a PC

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That's not right. I'll refer you to this EVGA forum thread where someone benchmarked scaling. Up to 2 way SLI it's fine, above that it begins to suck.

http://forums.evga.com/GTX-780Ti-Benchmarks-1x4x-SLI-Work-in-Progress-m2069079.aspx

 

above 2 way isn't very good at scaling for 1080p/1440p, once you get above those resolutions, and have the CPU power to feed them, they scale fine.

 

http://www.overclock.net/t/1415441/7680x1440-benchmarks-plus-2-3-4-way-sli-gk110-scaling

 

I would not recommend 3-4 way for normal everyday use, if you were running 4k, 5760x1080, 7680x1440, then yeah. But not for 2560x1440.

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- What performance are you getting now & What would you like it to be? I'm talking about FPS, not usage %.
- If your cards are at "over 90%" usage, do you mean near 100% (like 98 - 99%), or "just over" (like 92%). Are you using Vsync?

- What temps are you getting on your cards?

 

If we know that, we will be able to suggest the best route to take.

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So it only adds approx. 50% performance of 1 card?

 

 

This is an example here, 1 Titan = 42fs, 2 =64, 3=75

 

So going from 1 to 2 cards added 22fps, adding the 3rd card only added 11 fps 

post-17790-0-18650900-1406129853.png

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above 2 way isn't very good at scaling for 1080p/1440p, once you get above those resolutions, and have the CPU power to feed them, they scale fine.

 

http://www.overclock.net/t/1415441/7680x1440-benchmarks-plus-2-3-4-way-sli-gk110-scaling

 

I would not recommend 3-4 way for normal everyday use, if you were running 4k, 5760x1080, 7680x1440, then yeah. But not for 2560x1440.

 

You're right scaling tends to get better with higher resolutions but even then I don't think the price ot performance ratio is very good. On the other hand if you're running setups like that you're probably not worried about that particular ratio anymore.

 

Edited out stupid sentence.

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This is an example here, 1 Titan = 42fs, 2 =64, 3=75

 

So going from 1 to 2 cards added 22fps, adding the 3rd card only added 11 fps 

Thanks buddy :)

 

So I'm guessing the reason for bad scaling is because of poor optimization from the game developers?

The most common result of insufficient wattage is a paperweight that looks like a PC

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Thanks buddy :)

 

So I'm guessing the reason for bad scaling is because of poor optimization from the game developers?

 

i guess most engines were not designed to take into account multi gpus

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i guess most engines were not designed to take into account multi gpus

Yeah and that makes sense, people with multi-gpu's are in an extreme minority

The most common result of insufficient wattage is a paperweight that looks like a PC

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