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Strange GPU behaviour in GPU-Z. (is my card fried?)

Discussion in 'NVIDIA' started by mengo, Jul 7, 2014.

  1. mengo

    mengo New Member

    Jul 7, 2014
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    Hello people!

    I have a problem with my nVidia 750m and I need your help. I'm pretty sure the inevitable has already happened but inside me there is still a flicker of hope and I just wanted to hear a second opinion.

    my laptop> Acer Aspire V5 573G, intel core i5-4200U
    nVidia GT 750m 4096 MB, 967 MHz, : 900 MHz, DDR3,
    8GB RAM, Windows 7 x64

    the dedicated GPU (NV750m) has apparently stopped working. although it is found and listed in device manager and in the nVidia Control Panel, setting it as default in the "global" profile or choosing "run with graphics processor- High Perf. Nvidia" does nothing to actually start the GPU. I get low FPS in games because only the integrated Intel GPUcan be used (and GPU-Z detects its usage at 100%).
    the 750M meanwhile is at 0% usage and up to 8% sometimes even 23% (can those be just artifacts?) and exhibits the same strange pattern of individual spikes with the clocks and load indicators switching between their values and "-- %"

    here are the screenshots


    notice the missing Bandwidth value.... CUDA and DirectCompute shouldn't be missing also , right?


    I started a game in the middle of the testing period but patterns don't change as with the integrated Intel GPU below

    everything is alright with the integrated intel GPU

    it started when I was playing a long session of Mount & Blade and it started lagging slightly at certain places. Now M&B is not a GPU heavy game so i didn't realize that maybe the 750m had just turned off.
    Next day all 3d games and graphic rendering programs were at >halved fps.

    What I tried so hard and got not so far:

    *reinstalling nVidia drivers. (clean install)

    *disabling and uninstalling the integrated intel GPU driver and restarting results in windows booting with the basic VGA drivers... 3d games don't start at all

    *last known configuration

    *system restore to 1 day before it happened

    *getting the same reading from MSI afterburner , same spiky pattern , but there the spikes have lower peaks (max usage 4%)

    *CCleaner - registry repair

    *DxDiag shows only integrated Intel GPU but I think it could be normal .... Is there a way to REINSTALL DX ?

    *in BIOS there is no option to choose witch GPU to boot with

    the only other thing I can remember but I think is irrelevant is that I installed iTunes to listen to a stupid podcast from the university and it messed my DAEMON TOOLS somehow (I didn't know back then iTunes was the culprit) so it wasn't able to mount a virtual image. I should had fixed this by simply uninstalling iTunes but I followed the solution of some guys in the DT forum to delete those two registry entries:

    "UpperFilter" and "lowerFilter" values from HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} .... it has prob. nothing to do with the GPU problem

    I'm at loss here. I think the card is gone. It's still in warranty but having to backup everything and reinstall the whole system would be pain in the a**.

    Edit: I do apologize if this isn't the right place to post this. please be so kind to move it's if so.
    Last edited: Jul 7, 2014
  2. GhostRyder


    Apr 29, 2014
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    Just for reference, when you run a game do you use it in full screen mode or windowed mode. If windowed try Full Screen because I have seen issues with switching between the iGPU and regular GPU on my MSI laptop before.
  3. mengo

    mengo New Member

    Jul 7, 2014
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    tried both fullscreen and windowed and borderless on different games that worked before every time is the same

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