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590 in sli question/ pcie 2.0 bandwith limit??.....

post #1 of 15
Thread Starter 
hey guys,
So im trying to gather some info for my friend on the possible bandwith issues with pcie-2.0.
My question is if he were to get two 590s (or two 6990's for that matter) and put them in sli (quad sli)on a asus maximus p67 using the native 8x8 slots for sli, would he run into bandwith issues??that is would he over saturate the pcie2.0 slots? If we can find this out it will give him an idea about how much bandwith the new nvidia 680's will use(asuming that they will be double performance over the current 580). This will show him if he should wait for the new pci-e 3.o boards for the increased bandwith, or if its just a waste of money and he wont see any benifit unless he were to run say nvida 690's in sli.
If there are any of you guys out there running this kind of setup your results would be greatly appreciated!

thanks alot
Edited by MaCk-AtTaCk - 5/1/11 at 6:44am
    
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post #2 of 15
I personally think they are a waste in SLI, on any setup. If both slots run in PCI-E 2.0 x16, it will be fine. If they run in PCI-E 2.0 x8, you will likely have a bottleneck.

There is absolutely no way that the 680 would be double the performance of the 580. Maybe 30%. A 680 will likely be slower than a 590 because a 680 would be a single GPU.
Edited by Murlocke - 5/1/11 at 6:34am
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post #3 of 15
Thread Starter 
ya your prob right about it not being twice as fast but i think 680 will definalty be more than 30%...
    
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post #4 of 15
Quote:
Originally Posted by MaCk-AtTaCk View Post
ya your prob right about it not being twice as fast but i think 680 will definalty be more than 30%...
Based on the last 3 years, it will be around 30% or so. You are going single core to single core and GPUs haven't "doubled" for a very long time from only 1 generation. Going from single core to dual core doesn't count.

Graphs will probably look roughly like this:

Code:
690 |          |
590 |        | 
680 |       | 
580 |     |

Edited by Murlocke - 5/1/11 at 6:58am
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post #5 of 15
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wow thats intersting, i was under the asumption that the 5870 was close to the same perfomance as a 4870x2???? of course they went to a smalle node on the 5870, as will the new gpus later this year.
http://www.overclockers.com/forums/s...d.php?t=628791
you can see in the above review that the 5870 is indeed about the same speed as a 4870x2 thus about double the speed of a 4870..Which is where i come up with the 680 being as fast as a 590.
of course thats just a guess lol
Edited by MaCk-AtTaCk - 5/1/11 at 6:59am
    
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post #6 of 15
Quote:
Originally Posted by MaCk-AtTaCk View Post
wow thats intersting, i was under the asumption that the 5870 was close to the same perfomance as a 4870x2???? of course they went to a smalle node on the 5870, as will the new gpus later this year.
http://www.overclockers.com/forums/s...d.php?t=628791
you can see in the above review that the 5870 is indeed about the same speed as a 4870x2 thus about double the speed of a 4870..Which is where i come up with the 680 being as fast as a 590.
of course thats just a guess lol
Depends how well the drivers/game is at handling crossfire. Also I fix my graph above, it was bugged.

I usually don't care about average/max FPS (that's what ATI is good at), minimum frames are what to look at in my opinion, and NVIDIA usually has better min frame rates, but lower average/max frame rates.
Edited by Murlocke - 5/1/11 at 7:03am
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post #7 of 15
Thread Starter 
thats true.. the 4870x2 didnt have that great of drivers so the 5870 would seem to be double the speed of a 4870 asuming that the 4870x2 scaled perfectly. prob more like 50 to 70 percent faster then?
    
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post #8 of 15
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so basically do you think that the next gen top end cards like a 680 or 7970 in sli/crossfire would be fine as far as not maxing the bandwith of pcie-2.0?
    
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post #9 of 15
Quote:
Originally Posted by MaCk-AtTaCk View Post
so basically do you think that the next gen top end cards like a 680 or 7970 in sli/crossfire would be fine as far as not maxing the bandwith of pcie-2.0?
I think we have a ways to go still before maxing PCI-E 2.0. The next gen cards will probably be more efficient too.. so doubling the speed, won't double the power (or even close).
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post #10 of 15
isn't 3.0 coming out this year? :X
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