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Low gpu usage in crossfirex need help

Last response: in Video Games
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April 28, 2012 7:25:01 AM

Have you tried O.C.ing the CPU?

I used to have a Phenom ii x4 965 @ 3.8ghz and I found that it was bottlenecking my 6870 crossfire setup.If your 8120 is at stock clocks then that is most likely what is causing the poor GPU performance.

What is the make/model of your PSU?
April 28, 2012 1:43:02 PM

Quote:
Have you tried O.C.ing the CPU?

I used to have a Phenom ii x4 965 @ 3.8ghz and I found that it was bottlenecking my 6870 crossfire setup.If your 8120 is at stock clocks then that is most likely what is causing the poor GPU performance.

What is the make/model of your PSU?

yes i did overclocks the fx to 4Ghz the GPU usage are about the same 40 to 43% on both cards im using MSI Afterburner to monitor it
my power supply http://www.newegg.com/Product/Product.aspx?Item=N82E168... i also get stuttering in some games like mass effect 3 and Deus Ex Human Revolution
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April 28, 2012 8:31:08 PM

So if that PSU only has x2 6pins are you using a molex for the other x2 6pins?

I don't think that PSU is of very good quality.In fact I think your PC may be underpowered.
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June 14, 2012 2:23:53 AM

Im getting low GPU usage and FPS in crossfire with two 6870s im getting about 40% to 60% usage on both cards it happens most of my games but when i use 1 card it hits 99% i also tried re-installing drivers to see if it will help didn't work please help me with this.
games im getting low usage are The Witcher 2, Mafia II, Alan Wake, Saints Row The Third


sabertooth 990FX
amd phenom ii x2 555 unlocked to 4 cores at 4GHz
8GB RAM
6870 crossfirex
PC Power and Cooling Silencer Mk II 750W
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June 14, 2012 2:46:44 AM

If you are playing on low resolution that would explain it.
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June 14, 2012 2:48:19 AM

Also, upping the graphics will make the load higher.
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June 14, 2012 3:54:31 AM

I think you have posted this in the graphics section. But, what I said in your other thread, you may want to up your graphics settings.

Also, another member said to increase your resolution.
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June 14, 2012 11:45:05 AM

im playing on 1920x1080 all game setting are max out
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June 14, 2012 11:48:54 AM

im playing on 1920x1080 all game setting are max out
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June 14, 2012 11:58:03 AM

your cpu is bottlenecking an amd dual core doesnt have enough grunt to cope propperly with a single 6870 unless its running or oc'd to 3.0ghz 2 of em will cause a 40% choke or even negative scaling in crossfire. remove 1 of the cards until you can move up to a quad core...
even if you have unlocked it theres still the question of cache. and this is probably whats causing the choke on the gpu side.
when you unlock the extra cores you effectively halve the cache thus end up with much less performance from it. this is most likely the reason for your woe's
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June 14, 2012 8:58:12 PM

What fps are you getting?
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June 14, 2012 10:08:12 PM

6870s 1GB (Witcher 2 GPU1 42% GPU2 42% 34FPS)
(Alan Wake GPU1 61% GPU2 71% 42FPS) Metro 2033 GPU1 95% GPU2 99%
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June 14, 2012 10:41:20 PM

This topic has been moved from the section Graphics & Displays to section Video Games by Mousemonkey
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June 14, 2012 10:41:20 PM

This topic has been moved from the section Graphics & Displays to section Video Games by Mousemonkey
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June 14, 2012 10:42:28 PM

This next topics has been merged by Mousemonkey
  • Low gpu usage in crossfirex need help
  • Low gpu usage and FPS in crossfire
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    June 15, 2012 12:37:26 AM

    david1006 said:
    6870s 1GB (Witcher 2 GPU1 42% GPU2 42% 34FPS)
    (Alan Wake GPU1 61% GPU2 71% 42FPS) Metro 2033 GPU1 95% GPU2 99%

    You have AA enabled as well? Really looks like you have a CPU bottleneck but rather amazing with the CPU at 4GHz.
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    June 15, 2012 12:38:32 AM

    the amd cpu of the moment is the 960t you get a full quad with everything it needs and will run them 2 gpu's sweetly. to be honest im a little shocked your current 1 doesnt but as i said it could be the cache... but a 960t has more of it and has 4 full cores. you may even be able to unlock the 960t to get a 6 core but after your experience with the dual unlocking i dont think you would bother.

    anyways as you have already unlocked it, try overclocking it. if your overclock boots but you find the multiplyer has dropped and your pc is running at 1.2ghz or less(basically a lot less than it should be) it means the cores are unlocked but they are broken the end result is you never had 4 working cores anyway just a cpu that though it had 4 but was only able to use 2 or 3 of em... yes 4 can show up even if they dont work properly.

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    June 15, 2012 12:40:18 AM

    rolli59 said:
    You have AA enabled as well? Really looks like you have a CPU bottleneck but rather amazing with the CPU at 4GHz.

    the games listed are less cpu bound than bf3 so he would get higher fps...
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    June 15, 2012 12:52:45 AM

    HEXiT said:
    the games listed are less cpu bound than bf3 so he would get higher fps...

    Therefore amazing he is not getting more load on the GPU's hence bottleneck somewhere since the GPU's are not using their potential.
    OP take it you are using the latest drivers and CAB http://support.amd.com/us/gpudownload/windows/Pages/rad...
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    June 15, 2012 1:24:42 AM

    i always use the latest drivers but when on play a game like Saints Row The Third about 50% CPU load on all cores some with Mafia II, Alan Wake, but when i play Battlefield 3 i see 100% load on all cores and GPU usage are in the 90s% in ever game max out AA enabled everything
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    June 15, 2012 3:15:36 AM

    Mafia II and Alan Wake don't seem to be properly multithreaded then, and the Windows Scheduler is just spreading a dual core load over 4 cores. Try setting the affinity to two cores for those games, that may help get the most out of your overclock.
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    June 15, 2012 3:44:59 AM

    yes i played Alan Wake with the CPU as a phenom ii x2 555 4GHz CPU load was in the 90s% and 66% gpu load 40FPS its the same when its unlock to 4 cores. on 4 cores CPU load is about 50%
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