Suddenly bad gaming/graphical performance

Discussion in 'iMac' started by Der Kommandant, Jul 19, 2013.

  1. Der Kommandant macrumors member

    Der Kommandant

    Joined:
    Sep 25, 2012
    Location:
    The Netherlands
    #1
    Hi,

    I have a iMac mid 2011 which suddenly slowed down a lot in gaming and graphical performance. The first time I noticed this
    was while running Skyrim on Bootcamp Windows 8. The FPS dropped from around 60-30 like it used to be, to around 5. It became unplayable...
    I tried lowering settings and resolution, but the problem remained. After trying different games I noticed the same extreme fps drop.

    After that I'd scan for malware, nothing found. I checked temperatures, nothing wrong. I changed graphics drivers, no difference, I reinstalled Windows 8, no difference. I installed Windows 7, still no difference... As a last resort I tried resetting SMC and PRAM, but the problem remains.
    The gaming performance also seems to have dropped in OS X, DIRT 2 for Mac also is unplayable now....

    I ran an Apple Hardware test, no problems found. I reinstalled OS X Mountain Lion, still the same problem...

    What can be the cause of this?

    Thanks in advance
     
  2. Nightarchaon macrumors 65816

    Nightarchaon

    Joined:
    Sep 1, 2010
    #2
    This if its effecting other games than skyrim, is being caused by the heat build up slowing the CPU/GPU to avoid damage,

    Thats assuming your not running a mod that gives you 11million chicken followers or something.

    Try launching a different PC game of a similar graphical load, (Try Batman Arkham City), if that also runs slow then its the heat issue, if not, its something you have in skyrim, remove all your mods and try it again,
     
  3. Der Kommandant thread starter macrumors member

    Der Kommandant

    Joined:
    Sep 25, 2012
    Location:
    The Netherlands
    #3
    Thanks for your response,

    I already reinstalled Skyrim and tried it without mods, it was still unplayable. I will try Batman Arkham City, but I am sure it will be slow. If it's a heat issue how can I fix this?
     
  4. Georgio macrumors 6502

    Georgio

    Joined:
    Apr 30, 2008
    Location:
    Essex, UK
    #4
    I had a 2011 iMac and it ran extremely hot when gaming. I had to resort to SMC fan control to try and keep the GPU from going into meltdown.
    I'm guessing that you've fried something on the GPU, probably power related which is why you're getting such bad performance.
    You haven't noticed any odd smells coming from the top vents?
    I would also say that if the inside of you Mac has never been cleaned out, there's probably a build up of fluff on the heatsinks which will make the problem worse. You might need to crack the case to clean everything out.
    Have you noticed the fans being more noisy than usual?
     
  5. Der Kommandant thread starter macrumors member

    Der Kommandant

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    Sep 25, 2012
    Location:
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    #5
    No actually I almost never hear them. I also tried using SMC fan control, but running fans at maximum speed did not make any difference in performance. A few minutes ago I tried iStat menus, to see what load my GPU was on. According to IStat Menus my GPU was on 100% load while in idle. Maybe this has something to do with the performance
     
  6. Nightarchaon macrumors 65816

    Nightarchaon

    Joined:
    Sep 1, 2010
    #6
    if your GPU is running full tilt all the time, is this just under bootcamp, or also under Mac OS X?

    Do you have any Mac OS 3d games to try (perhaps assassins creed, borderland 2 or something else in steam like portal or half life ? )

    if you have no issues under Mac OSX but issues under windows i would suggest grabbing the latest driver for the video card for windows,

    im using this one at the moment http://support.amd.com/us/kbarticles/Pages/AMDCatalyst13-6WINBetaDriver.aspx, you want the normal one, not the mobility one.

    See if that helps,
     
  7. Der Kommandant, Jul 20, 2013
    Last edited: Jul 20, 2013

    Der Kommandant thread starter macrumors member

    Der Kommandant

    Joined:
    Sep 25, 2012
    Location:
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    #7
    I just tried running Batman Arkham City on OS X and did a Benchmark. The average fps was 11, so same problem again. I tried Dirt 3 on Bootcamp, it also ran extremely slow even after installing the drivers. Strangely enough the GPU load is not 100% when idle in Bootcamp, while in OS X it is 100% when idle. I uploaded some screenshots of GPU-Z, maybe it shows something.
     

    Attached Files:

  8. blueroom macrumors 603

    blueroom

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    Feb 15, 2009
    Location:
    Toronto, Canada
  9. Der Kommandant thread starter macrumors member

    Der Kommandant

    Joined:
    Sep 25, 2012
    Location:
    The Netherlands
    #9
    I already tried that multiple times, didn't solve the problem unfortunately.
     
  10. Thraun macrumors regular

    Thraun

    Joined:
    Dec 18, 2008
    Location:
    Abbotsford, BC
    #10
    Well, it sounds like it could certainly be a faulty graphics card/logic board. Is it under warranty? Either way, take it into an authorized service provider and get them to check it out.
     
  11. forty2j macrumors 68030

    forty2j

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  12. Commy1 macrumors 6502a

    Commy1

    Joined:
    Feb 25, 2013
    #12
    I'm genuinely surprised that the 6700M could ever handle Skyrim at a decent FPS whether in Bootcamp or OSX. I'm using a 6750M in a 2011 iMac and I can barely get 60 FPS out of Borderlands 2 on Lowest settings on OSX. Similar story with DOTA 2.

    I've been trying to avoid gaming on this machine any how, it's my productivity machine, if I wanted gaming power I'd have stuck with my desktop monster.
     
  13. Nightarchaon macrumors 65816

    Nightarchaon

    Joined:
    Sep 1, 2010
    #13
    i have the 6770 model in my imac, runs skyrim perfectly, on ultra, with a ton of enhancement mods on at 1600x900 res.

    at native res things get a little slow at times, but rarely less than 24fps, to keep things at the 45+ i had to drop the rez

    but the 6770 runs almost every game ive tried so far with no problems at 1600x900 or 1920x1080

    under boot camp gaming is supurb, under macOS it sucks, but then, dated drivers, unoptimized code and shoddy mac conversions are going to hit gaming performance.

    even things like diabo III which are mac native run far better under windows on the same machine
     
  14. Commy1 macrumors 6502a

    Commy1

    Joined:
    Feb 25, 2013
    #14
    Hmm that is interesting, I suppose I'm underestimating my GPU. I've been an Nvidia man forever and understand the cards inside and out, AMD shouldn't be much different. I'll do some more research, what Nvidia card is comparable to the 6750? GTX 650 or less?
    That the drivers are probably outdated makes sense on OSX, I wish they weren't OSX incorporated.
     
  15. forty2j macrumors 68030

    forty2j

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    Jul 11, 2008
    Location:
    NJ
    #15
  16. Commy1 macrumors 6502a

    Commy1

    Joined:
    Feb 25, 2013
    #16
    That's what I thought. I looked up a comparison and they compared it to the GTX 540, coming out on top by a nice lead. I'd say running it with the property drivers the 6750 equates to a 550/555M or a 630M. Kinda cruddy when you look at it like that. But oh well, my productivity college machine isn't meant for gaming, probably best off this way. For now Muahahahaha :D
     
  17. seamer macrumors 6502

    seamer

    Joined:
    Jul 24, 2009
    #17
    Remove Windows from the equation and find a comparable OSX version of a modern game; Guild Wars, Diablo 3, Civ5. If they run fine under OSX and suck under Windows, it's a driver thing. If they suck all over, it's a hardware thing.
     
  18. tlrominger macrumors newbie

    Joined:
    Jul 1, 2013
    #18


    I had the same problem with my 2011 iMac under bootcamp and windows 8. It turned out to be drivers and went away when I used the new version 5 of bootcamp...
     
  19. planetfrank macrumors newbie

    Joined:
    Sep 19, 2013
    #19
    I have exactly the same problem

    MacBook Pro
    15 inches, early 2011
    Processor 2 GHz Intel Core i7
    Memory 4 GB 1333 MHz DDR3
    AMD Radeon HD 6490M 256 MB
    Software Mac OS X Lion 10.7.5


    I made the latest update today and all the sudden my favorite game stoped working properly: Dirt 2 (on Mac OS X)

    I did try most of the ideas you guys had (fans control, change resolution).

    This is bad!


    the fact is the the fans are off.

    Usually when I run the game it inmediatly turned on the fans and keep it like that all the time
     
  20. planetfrank macrumors newbie

    Joined:
    Sep 19, 2013
    #20
    Discharging the battery

    It is working properly now.
    It looks like a problem with the carger.
     

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