iMac27": Playing Left 4 Dead 2 For 20 min, Then Game Starts To Slow Down, Unplayable

Discussion in 'iMac' started by rs14smith, Jan 2, 2010.

  1. rs14smith macrumors regular

    Joined:
    Dec 7, 2009
    #1
    Hey everyone,

    I just installed windows 7 via Boot Camp, and then installed the game Left 4 Dead 2 on it and started to play the game, and everything was going well until about 20 minutes of playing it.

    The game soon started/continued to slow down, or have that lag effect, however, let me note, I'm playing this offline "single player mode" just to make sure it had nothing to do with my internet. Also let me note, nothing else is running on the computer at the time, no updates, nothing.

    So then I touched the top of the monitor, and it was extremely extremely hot, and of course since I'm playing a game the GPU will produce more heat, but the only thing I could think of is, the GPU is becoming too hot and effecting my game play. I know most say Apple is very smart and heat should not have an issue, but what else would cause this as everything else on my iMac works fine, and when I close out the game, everything works alright. Videos play fine etc..

    I haven't heard anyone else have this problem so I wanted to ask you guys who are experts here to tell me what you think it is?

    I will make a video on this later just to show the problem.

    Thanks :)
     
  2. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #2
    You need to find out exactly what temp your GPU is running at. All iMacs get hot at the top because aluminum is an excelltent conductor of heat. Try something like RealTemp from techpowerup.
     
  3. rs14smith thread starter macrumors regular

    Joined:
    Dec 7, 2009
    #3
    Thanks! That's what I was looking for right after I posted it so I could give you guys more information when I filmed it.

    Do you know what I could do to get the FPS while playing the game?

    Thanks!
     
  4. rs14smith thread starter macrumors regular

    Joined:
    Dec 7, 2009
    #5
    Thanks again, I forgot the name. :)

    Making the video now...
     
  5. iSee macrumors 68040

    iSee

    Joined:
    Oct 25, 2004
    #6
    Maybe the Time Machine backup kicked in? Not sure if it would have such an effect... just an idea. I guess it could be some other process, too.

    When it happens again, open Activity Monitor, make sure "All Processes" is selected and sort by CPU%. Look at the top of the list and see if anything is hogging the CPU.
     
  6. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #7
    You can also use something like this: http://www.cpuid.com/hwmonitor.php to get a complete temperature picture.

    I doubt if its TM as he's in bootcamp under Windows 7.
     
  7. iSee macrumors 68040

    iSee

    Joined:
    Oct 25, 2004
    #8
    :eek:
     
  8. crut macrumors regular

    Joined:
    Dec 26, 2009
    #9
    If everything else is fine, is it possible that there is some bug in L4D2?
     
  9. Rodus macrumors 6502a

    Rodus

    Joined:
    Oct 25, 2008
    Location:
    Midlands, UK
    #10
    ^^Technically possible but before going down that route try downloading SMC fan control, boost up the fan speeds a bit and restart into Windows, then run L4D and see what happens.
     
  10. crut macrumors regular

    Joined:
    Dec 26, 2009
    #11
    Aye, sounds reasonable :)
     
  11. grayskyz macrumors regular

    grayskyz

    Joined:
    Nov 21, 2008
    Location:
    Los Angeles
    #12
    What kind of frame rate are you getting on that btw?
     
  12. tomacintosh macrumors regular

    Joined:
    Aug 25, 2005
    #13
    I didn't think Windows 7 was officially supported by Bootcamp yet? Could be a driver issue.
     
  13. rs14smith thread starter macrumors regular

    Joined:
    Dec 7, 2009
    #14
    Hey guys, I'm proud to annouce I was not able to replicate the problem again after playing L4D for like 2+ hours.

    So my guess something else behind the scense was going on at the time I was no aware of.

    Yay!! :p
     
  14. crut macrumors regular

    Joined:
    Dec 26, 2009
    #15
    Cool beans. Enjoy :D
     
  15. Travisimo macrumors 6502a

    Joined:
    Dec 22, 2009
    #16
    I had a similar problem last night when playing Crysis in Boot Camp under Windows 7. I have the 27" i5 imac with 8Gb of Ram and when I clicked on the Auto graphics settings, it chose "High". Well, at full res 2550x1440, it pretty much crawled at those settings, so I bumped down the resolution and then it played pretty smooth.

    However, about about 20-30 minutes, it started getting really slow. I would describe it as "jitter", where your turn the mouse to look around and it sort of jumps around on screen. Not sure if the hard drive was being accessed during this time or not because I can't hear the darn thing! lol. But since i have 8GB of Ram (and using 64 bit Windows 7), I wouldn't think it would need to access the HD much? Even bumping the settings down to "Medium" or "Low" did not seem to help... it still jittered quite a bit.

    Any ideas?
     
  16. tomacintosh macrumors regular

    Joined:
    Aug 25, 2005
    #17
    It was the yellow screen, that's the problem, it was weighing you down.
     
  17. Rodus macrumors 6502a

    Rodus

    Joined:
    Oct 25, 2008
    Location:
    Midlands, UK
    #18
    Have you guys all updated to the latest ATI drivers rather then the not-very-good Apple ones, if not head over to the Mobility Modder site and follow their instructions.
     

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