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780 SLI Voltage and Core Clock Drop Under Stress

post #1 of 6
Thread Starter 
I'm not getting voltage drops everywhere, and as a matter of fact I seem to be only getting drops in BF3 in that one CQC map with the office building with a parking lot underneath. On a 48 man server when the entire server is fighting at one choke point I see that my core clock and voltage drop ever so slightly, memory clock stays the same though. My power supply is a Bequiet 1000w Dark Power Pro 10. I'm using one pci-e connector, which is a 6 pin and 8 pin put together, for each card. Should I be using two connectors for each card? Like use one connector solely for 6pin and another solely for 8 pin?

What could be causing the voltage and core drop and how can I avoid it? I notice that when the fps hits the fan enough that the drops happen, it doesn't happen when the fps drops but rather after maybe two seconds of low fps.
Edited by Spudinske - 9/10/13 at 6:22am
post #2 of 6
If I play on just one monitor, I also get the GPU usage drops but if I play on 3 monitors, I don't see the GPU's drop at all. The game has a 200fps cap, so possibly that. I clocked my 3930K at 5Ghz just to make sure it wasn't a CPU bottleneck (which it wasn't) but I never did get to the bottom of it and it never bothered me that much, so forgot about it smile.gif
    
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Asus Rampage IV Formula Asus Geforce GTX Titan Asus Geforce GTX Titan Avexir 
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post #3 of 6
Thread Starter 
Quote:
Originally Posted by Gregster View Post

If I play on just one monitor, I also get the GPU usage drops but if I play on 3 monitors, I don't see the GPU's drop at all. The game has a 200fps cap, so possibly that. I clocked my 3930K at 5Ghz just to make sure it wasn't a CPU bottleneck (which it wasn't) but I never did get to the bottom of it and it never bothered me that much, so forgot about it smile.gif
Gpu usage I can understand, but this is core clock and voltage drops.
post #4 of 6
Sounds like throttling to me. That is if it's just a minor drop of 13-26MHz. Most likely you're hitting the power limit. Though personally I never hit it in BF3, it's still possible.
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by specopsFI View Post

Sounds like throttling to me. That is if it's just a minor drop of 13-26MHz. Most likely you're hitting the power limit. Though personally I never hit it in BF3, it's still possible.
Yea it's just dropping like a few MHz and a tiny bit of voltage. However my power %'s and temps are way below limit.
post #6 of 6
Quote:
Originally Posted by Spudinske View Post

Yea it's just dropping like a few MHz and a tiny bit of voltage. However my power %'s and temps are way below limit.

You should monitor all the reason flags (temp, power, voltage, OV max, utilization) and see which one of them triggers it. I've seen the power reason flag to trigger even if the power limit % hasn't hit the max allowed, maybe something about the monitoring interval not registering the absolute max power %. There's a whole lot on these reason flags in my 780 vs Titan review found in my signature.
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