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Can anyone solve this riddle. Where is the bottleneck.

post #1 of 16
Thread Starter 
OK Ill try and be detailed as possible.

I am playing (not sure if thats the right word for it) the sim DCS a-10.

I am playing it in nvidia surround, in triple sli where all 3 screens are active during play.

When I enter the game, and am flying and looking straight ahead, fps is fine.

I get a smooth 40-50 fps during this time.

Then when I go to turn my head around and look to the left of the cockpit for example, the FPS drops suddenly to like 6 or so for 2 or 3 seconds, then shoots back up to 40-50 (even higher). Then I look straight again, everything is fine. Then I look that same spot again, every thing is fine.

Then After a while I look another direction again and once again I get a huge fps drop to 5-6 fps again for a few seconds. Rinse and repeat.

My question is whats most likely causing this sudden fps spike down?

Ok for my system specs,

Windows 7 64bit.

Memory 8 gigs DDR2 ocz gaming ram @ 800 mhz UNLINKED, set to optimal in bios.

780 sli ftw.

q9650 at 400x9 , 3600mhz stable.

3x evga gtx 280s, I havent overclocked them as they were already clocked decently from factory, cores running at 691 mhz.


Im not running anything in the backround.

OK which sherklock holmes can figure out this riddle?

Where is the bottleneck?
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post #2 of 16
Possible vram issue?
    
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post #3 of 16
Thread Starter 
Hmm how would I know if it was vram issue?
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post #4 of 16
Use GPU-Z to monitor your VRAM usage.
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post #5 of 16
Definitely vram.

Read this thread and look at the vram bottlenecks he ran into even with 1.5Gb GTX580's. He's now running 3Gb GTX580's and all seems to be well. DCS-A10 is one of the games that he benchmarks/plays and he had a much better experience with more vram.

Your GTX280's don't have near the vram that would be intended for Surround for that game as well as Crysis, Metro, as well as whatever else once you start piling on the AA.

Nvidia needs to realize that while Surround works quite well, they need to produce cards that can handle it by adding more vram.
Edited by _CH_Skyline_ - 3/21/11 at 1:45pm
 
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post #6 of 16
Pretty much as above Vram will kill you when running suround/eyefinity, I had problems with my original 5870 1gb cards and had to get the e6 2gb cards, even so I cant move the AA/AF too high on some games or i'm crippled by it ><

Remember SLI/Crossfire only gives you the ram from one card so despite having 3 1gb cards it can still only use 1gb of vram.
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post #7 of 16
Thread Starter 
OK first thanks for the replies,

I am in gpuz .5.1 right now, and Im looking at the memory used..

The highest it got was 127mb while I was experiencing the problems.. I have 1024 mb per card.


Or is that not vram usage?
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post #8 of 16
Is that a snap shot taken after you alt tab back into windows? becuase if so its entirely useless look at the log file and see what the highest usage was.

If not then I have no Idea whats up you shouldnt be on 17% gpu load running suround I just dont see that as possible

also as I noted above you dont have 1gb per card you have 1gb total you cannot access the other 2 only 1 cards ram counts (or more accurately only the lowest memory card counts).
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post #9 of 16
Thread Starter 
Quote:
Originally Posted by Dr216 View Post
Is that a snap shot taken after you alt tab back into windows? becuase if so its entirely useless look at the log file and see what the highest usage was.

If not then I have no Idea whats up you shouldnt be on 17% gpu load running suround I just dont see that as possible

also as I noted above you dont have 1gb per card you have 1gb total you cannot access the other 2 only 1 cards ram counts (or more accurately only the lowest memory card counts).
Haha ok. I see it now. I clicked on continue refreshing while in backround and sure enough it maxed out to 1022 mb.

Gpu load went only as far as 62%, probably because the memory was bottlenecking it before it could use more probablty.

Thanks guys.. I guess theres no options here . Or is there...

Oh and plus rep all around.
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post #10 of 16
Quote:
Originally Posted by bloomstomb View Post
Haha ok. I see it now. I clicked on continue refreshing while in backround and sure enough it maxed out to 1022 mb.

Gpu load went only as far as 62%, probably because the memory was bottlenecking it before it could use more probablty.

Thanks guys.. I guess theres no options here . Or is there...

Oh and plus rep all around.

How far have you turned down AA/AF those are the biggest killers. If not not realy much you can do without buying cards with more ram.
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Overclock.net › Forums › Graphics Cards › NVIDIA › Can anyone solve this riddle. Where is the bottleneck.