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2x 6970 or 4x 580? - Page 6

post #51 of 65
Quote:
Originally Posted by BadAssClocker View Post
\\
3x 3gb (if i get 3 580s) of ram = 9gb total i can use
4x 2gb (if i were to get 4 6970's) of ram= 8gb total i can use
the point of this thread was to see what would be the best option for the most amount of ram because i am working in large resolutions!!!!!!!!!!!

and for those who posted "oh this is not a fair competion" well 4x 580 with 512mb of ram each equal 4gb or ram total, and 2 6970 2gb each equals 4gb total
This isnt how it works.....

GTX580 has 1536 mb - doesnt matter how many more you add, you will only have 1536 to work with.

6970 have 2gb - so matter how many more you add, you are using 2 gigs.
post #52 of 65
accessible VRAM does not change when you add additional gpu's

so if you have a 6970 (or 6950) 2gb of vram is...2gb of vram

-580's have 1.5 (Palit/Gainward make a 3gb version, I have a Palit and 2 more coming from UK, another member Vega has 4 of these)

so just to make it clear to everyone, 4x580's (OEM versions) will only have 1.5gb of VRAM
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post #53 of 65
4x GTX 580's will be a top performer, but I'd save the money and just get 2x 580's and put the other money elsewhere

You won't see much more performance out of the other 2 GPU's -- As for horsepower/resolution

.5gb isn't enough to justify the actual performance a GTX 580 is over the 6970. You'll only see the 6970 'close the gap' at the extreme resolutions, but that's it.
     
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post #54 of 65
When you have 2+ cards in SLI/CFX they all work on alternating frames but all have a pool of memory that is shared.

Card A Does Frame 1 (Has all the game data needed loaded on it's Vram, updates Vram of all cards as it goes)

Card B Does Frame 2 (Has the same game data loaded on its Vram, updated by Card A)

Card A Does Frame 3 (same data, updated by Card B)

...etc

How would card B do the second frame if it had completely different data on its Vram compared to A? Your total VRAM ammount is equal to the smallest single card amount.

For your higher resolution, i would take 2 or 3 6970's because that's where the 69xx series shines (high res) and the 3GB 580's seem pretty scarce
Edited by SyncMaster753 - 2/27/11 at 6:42pm
    
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post #55 of 65
id go with 3x 3gb 580 with EK blocks, good luck with your rig, hydrocoppers are a gimmick btw
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post #56 of 65
Quote:
Originally Posted by rdrdrdrd View Post
id go with 3x 3gb 580 with EK blocks, good luck with your rig, hydrocoppers are a gimmick btw
^ This. 3gb 580's will probably wreck 6970s. And will work well for insanely high resolutions.
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post #57 of 65
Thread Starter 
okay sorry i gues i mis understood how sli and cfx works =( but thanks for clearing it up
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post #58 of 65
Now to get 3x 2560x1600 monitors to actually use that 3GB of VRAM.
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post #59 of 65
LOL! Just get one 580, for your setup. And use the money somewhere else. You will notice ZERO performance difference! I swear!
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post #60 of 65
Quote:
Originally Posted by TheBlademaster01 View Post
Now to get 3x 2560x1600 monitors to actually use that 3GB of VRAM.
Could probably do this in many games with just 3 1080p or 1920 x 1200 displays.

It's not uncommon for me to use 800-900 or more mb of vram. Unless vram used doesn't scale directly with additional resolution that is.
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