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Question/Help Crossfire gpu usage fluctuation.

post #1 of 6
Thread Starter 
Okay so I don't know if this is normal but cant really find a concrete answers on the interwebz.

First of all let me say this is observed on BF3 with the latest official (non beta) amd driver. Here is the cenario:

1 gpu (7870) everything ultra and 99% gpu usage observed. Maximum card clock maintained, cpu usage is between 40-60% on all cores and only about 5gb used out of 16gb of ram.
Crossfire gpus everything Ultra and usage bounces around between 65-90% with maximum card clocks maintained. Cpu usage at 40-60% on all cores and only about 5gb used out of 16gb of ram



Now here is the thing, when the gpu usage on crossfire dips so do the fps. Not because the cards are maxed out but simply because usage goes down.

Is this normal behavior or should I look for probable causes or fixes?

I'm planning on upgrading my monitor to either 120hz or 144hz and am making sure my system can hold a refresh rate that high. (currently at 1080p 60hz) All this is observed with msi afterburners latest beta with ulps disabled.

Ideas / Tips? biggrin.gif
   
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post #2 of 6
I would try different driver see if your problem still persists, maybe try the beta.

IF that doesnt work I would try looking into turning off your ULPS (Ultra low power state) which will decrease power to your second card if it isnt running a 3d application etc and can interfere with gaming.
Edited by spikezone2004 - 10/26/13 at 1:57pm
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post #3 of 6
Thread Starter 
I'm trying the beta right now and the results are the same.
ULPS has been disabled to keep that second card from running full tilt at idle.

I'm wondering if this is power related. I'm going to see if possibly raising the power limit in afterburner makes a difference.

Any other ideas? Am I chasing something that is simply the way it's supposed to work?
   
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post #4 of 6
Thread Starter 
Battlefield 4 and still gpu usage dropping to 60 or so on both cards and not maxing out on 13.11 beta 7
   
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post #5 of 6
I am really not sure if ULPS is disbaled and you have tried other drivers, do you have enough power going to your cards?
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Bitfenix recon fan controller XSPC 750 res/pump rev4 Alphacool ST30 240mm Radiator XSPC 240mm Radiator 
CoolingOSMonitorMonitor
2x XSPC 120mm Fans Windows 7 Professional  Dell 24" LED Dell 24" LED 
KeyboardPowerCaseMouse
Lame Basic One ThermalTake Toughpower 750W Gold Cooler Master 620 II Advanced Logitech G700 
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post #6 of 6
Thread Starter 
Yes I disabled ULPS because it made my second card run full clocks all the time even at idle.

As far as drivers Ive tried the last 2 or 3 whql drivers and the beta and it still does the same thing.

As far as power im using +20% in afterburner and my power supply is 850 so it should be adequate.




I still haven't tried flashing BIOS to see if raising TDP limit will have any affect, but hopefully soon I can try that.
   
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Custom Loop Windows 8.1 QNIX QX2710LED Logitech G710 
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Cooler Master V1000 Zalman GS1000 Logitech G502 Sound Blaster Z 
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