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460 sli 60% bf3

post #1 of 17
Thread Starter 
I was playing bf3 for a few weeks not realizing my sli was turned off... so I just turned it on yesterday and I'll have MSI running while playing and it will show one of my gpu running at 98% while the other will only run at 60%, is this normal, shouldn't they both be running in the high 90's?
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post #2 of 17
Is vsync on? If it locks you at 60fps then the usage would go down, otherwise it should be at 98%+, that's how my 560's always are.
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post #3 of 17
Thread Starter 
Im going to bring this topic back up because I am still having problems. vsync is off and now I am getting around 40% gpu usage with my first gpu.

Anyone know what might be the problem, I have a dual monitor setup, could it be something to do with that?
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post #4 of 17
I can't be a ton more help but if you look at my posts I had a similar problem and someone posted a big thing detailing possible bottlenecks. I can't find the link right now but when I'm on my pc I'll pull it up. Might describe it a little.
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post #5 of 17
The lack of Vram could be causing you to bottleneck.
post #6 of 17
I experience this with GTX 570s in SLI with dual monitors also recently after switching my cards around into a new mode (16x/8x)

Check your PCI-E config. Are you running 16x/8x or 16x/16x? I never had problems in 16x/16x and now all of a sudden I am in 16x/8x. Only difference is using a 3-way SLI bridge instead of a 2 way...
post #7 of 17
The lack of VRAM could indeed hold the usage down, I don't think your CPU would be a bottleneck. Maybe you need to feed your IOH more voltage. It could also be a driver issue, I remember in Bad Company 2 sometimes the usage would suddenly drop to 40% for no reason and after a minute it would go back up. I haven't noticed that in BF3 yet but I do get other kind of lag lol.
    
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post #8 of 17
Quote:
Originally Posted by RawFoodPhil View Post

The lack of Vram could be causing you to bottleneck.

Yes, but in theory it should affect both cards the exact same way. I monitor vram usage on both my cards all the time, and it's always exactly the same vram usage on both cards. I've also created scenarios where I was exceeding my vram capacity, and it didn't cause my usage to get wildly out of sync like this.
Quote:
Originally Posted by alphamanG View Post

I experience this with GTX 570s in SLI with dual monitors also recently after switching my cards around into a new mode (16x/8x)
Check your PCI-E config. Are you running 16x/8x or 16x/16x? I never had problems in 16x/16x and now all of a sudden I am in 16x/8x. Only difference is using a 3-way SLI bridge instead of a 2 way...

Mismatched PCI-Ex slot speeds could definitely cause gpu usage to be slightly different on each card, but I doubt it could cause a discrepancy of this magnitude. That's a good thought though, and the possibility further explored!
Quote:
Originally Posted by Emmanuel View Post

The lack of VRAM could indeed hold the usage down, I don't think your CPU would be a bottleneck. Maybe you need to feed your IOH more voltage. It could also be a driver issue, I remember in Bad Company 2 sometimes the usage would suddenly drop to 40% for no reason and after a minute it would go back up. I haven't noticed that in BF3 yet but I do get other kind of lag lol.

See my first reply. It could, yes, however, it should affect both cards identically, not cause one to be dramatically lower like we're talking about in this case.

My first suggestions are: disconnect the 2nd monitor, see if that fixes it. Also, you aren't running in Windowed mode are you? If so, don't wink.gif

Also, dumb question, but ... you have double-checked that that SLI is indeed enabled, right?

Also, the one w/the higher usage doesn't happen to be stuck at low-power 3d mode by some chance (which is 405MHz on my cards, not sure on a 460)?
    
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post #9 of 17
Thread Starter 
Quote:
Originally Posted by brettjv View Post

Yes, but in theory it should affect both cards the exact same way. I monitor vram usage on both my cards all the time, and it's always exactly the same vram usage on both cards. I've also created scenarios where I was exceeding my vram capacity, and it didn't cause my usage to get wildly out of sync like this.
Mismatched PCI-Ex slot speeds could definitely cause gpu usage to be slightly different on each card, but I doubt it could cause a discrepancy of this magnitude. That's a good thought though, and the possibility further explored!
See my first reply. It could, yes, however, it should affect both cards identically, not cause one to be dramatically lower like we're talking about in this case.
My first suggestions are: disconnect the 2nd monitor, see if that fixes it. Also, you aren't running in Windowed mode are you? If so, don't wink.gif
Also, dumb question, but ... you have double-checked that that SLI is indeed enabled, right?
Also, the one w/the higher usage doesn't happen to be stuck at low-power 3d mode by some chance (which is 405MHz on my cards, not sure on a 460)?
Just tried unplugging one monitor, no love, the one GPU is going at about an average of 65%.
I am not running in windowed mode and yes SLI is enabled, I have even uninstalled and re-installed the drivers twice.

How do I check if it is stuck in low-power 3d mode?
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post #10 of 17
Quote:
Originally Posted by maple_leafs182 View Post

Just tried unplugging one monitor, no love, the one GPU is going at about an average of 65%.
I am not running in windowed mode and yes SLI is enabled, I have even uninstalled and re-installed the drivers twice.
How do I check if it is stuck in low-power 3d mode?

open up msi afterburner [or another monitoring program, then open up bf3 and play for a minute, then alt tab out and see what your clocks were at during play.

if they're a few hunrded under stock you'll know that's the problem. I dont think it is, though, because when my 560ti would underclock the usage would be constant 100, it just wouldn't go into 3d clocks.
    
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