Is iMacs "8800GS" really the 8800GT?

Discussion in 'iMac' started by sir. mac, Jun 4, 2008.

  1. sir. mac macrumors regular

    Joined:
    Nov 21, 2006
    #1
    Just read this over at the Apple official forum:

    "The belief that iMacs use mobile chips is completely dumbfounded. All the intel iMacs at least use desktop variants, hence the close performance between the iMac's 8800GS and the Mac Pro's 8800GT (The iMac actually has the same card as the Mac Pro, just underclocked to GS frequencies, hence the 512MB config, the GS coming in 384 and 640MB configs). Also, there is no 8800M GS available." (thread here)

    Can someone shed some light on this? Could my Nvidia 8800GS really be a underclocked 8800 GT? :eek:

    Here´s the specs for the 8800 GS:
    Core Clock (MHz) 550 MHz
    Shader Clock (MHz) 1375 MHz
    Memory Clock (MHz) 800 MHz
    Memory Amount 384MB
    Memory Interface 192-bit-bit
    Memory Bandwidth (GB/sec) 38.4
    Texture Fill Rate (billion/sec) 26.4

    And here´s specs for the 8800 GT:
    Core Clock (MHz) 600 MHz
    Shader Clock (MHz) 1500 MHz
    Memory Clock (MHz) 900 MHz
    Memory Amount 512MB
    Memory Interface 256-bit
    Memory Bandwidth (GB/sec) 57.6
    Texture Fill Rate (billion/sec) 33.6

    And here´s info for the 8800GTS:
    Core Clock (MHz) 650 MHz
    Shader Clock (MHz) 1625MHz
    Memory Clock (MHz) 970 MHz
    Memory Amount 512MB
    Memory Interface 256-bit-bit
    Memory Bandwidth (GB/sec) 64
    Texture Fill Rate (billion/sec) 41.6

    Since we know for sure that we don´t have the official 8800 GS (because of the 512MB mem and 256 bit memory interface in the iMacs "8800GS"), I guess it´s only logical that this is an underclocked version of the GT or the GTS.

    Either way, this would mean that it´s a perfect candidate for overclocking, only that so far it seems no one has managed to (even with drivers from laptopvideo2go, specificially these: 169.12).

    As somebody said on another forum there was very little difference in graphical performance between the iMac and the Mac Pro, after updating the iMac with drivers from Laptopvideo2go. But isn´t it necessary to flash the firmware or softmod it in order to up the memory speed? Or is it enough just to install different drivers in order to get higher clocking speeds? And if the only solution is to flash the firmware, does anyone know if doing this would create a problem with the Leopard system? :confused:
     
  2. VanNess macrumors 6502a

    VanNess

    Joined:
    Mar 31, 2005
    Location:
    California
    #2
    According to system profiler, the device id is 0x0609

    According to Nvidia, that device id is assigned to the 8800 GTS, so it seems the card is the 8800 GTS
     
  3. sir. mac thread starter macrumors regular

    Joined:
    Nov 21, 2006
    #3
    That´s great news! Guess the "8800GS" really is bang for the buck. Now we only need to figure out how to o/c this thing :cool:
     
  4. Mollemand macrumors regular

    Joined:
    Aug 1, 2007
    #4
    It might be under-clocked for a reason. The iMac is quite the achievement when it comes to heat-management in confined spaces. I would suggest that if it indeed is a under-clocked GTS, it is probably so because the aluminum would start to melt and the screen blacken at a higher clock frequency.

    Pure speculation on my part though.
     
  5. sir. mac thread starter macrumors regular

    Joined:
    Nov 21, 2006
    #5
    We´ll see soon.. I just overclocked this thing (in Bootcamp Vista) to full standard for the GTS. Forget all I said about Rivatuner not working. Works like a charm for o/c :)
     
  6. blueclax macrumors newbie

    Joined:
    Jun 4, 2008
    #6
    Any major issues? How does it compare with 8800gt? Have you had a chance to run any benchmarks with O/C vs non o/c? I can't wait to get my iMac 24" 2.9GHz w/ 8800gs and run some 3DMark tests.
     
  7. sir. mac thread starter macrumors regular

    Joined:
    Nov 21, 2006
    #7
    I haven´t done any benching. But I´d say that COD4 was a lot smoother o/c. Crysis was no better though, so now I ramped it up to the max in Rivatuner and we´ll see. I´ll report back. Cool if you post some benches from 3Dmark!
     
  8. Mollemand macrumors regular

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    Aug 1, 2007
    #8
    That is very brave. I have my fingers crossed for you :D
     
  9. SaSaSushi macrumors 68040

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #9
    I just love misinformation like this.

    No, according to nVidia the 0x0109 part is the

    GeForce 8800M GTS

    That is the mobile variant of the 8800GTS. That is what the "M" indicates. The desktop GeForce 8800 GTS has the part number 0x0193.

    Anyone using common sense can understand that there will never be desktop GPUs used in an iMac. The enclosure is obviously far too compact for the cooling that would be necessary.

    This page has a very detailed description of the GPU in your new iMacs.

    Whoever started that thread on Apple's forums is a moron.

     
  10. Pressure macrumors 68040

    Pressure

    Joined:
    May 30, 2006
    Location:
    Denmark
    #10
    If you had searched you would have found out that the Apple branded Geforce 8800 GS is in fact a Geforce 8800M GTS with 64 Stream Processing Units.

    Update: Seems I got ninja'd ;)
     
  11. D4F Guest

    D4F

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    Sep 18, 2007
    Location:
    Planet Earth
    #11
    No fish in the sea today for dinner Sushi??:D
    I can clearly see tho that you are learning from the master:p:cool::cool::p
     
  12. SaSaSushi macrumors 68040

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #12
    Hey, buddy. Long time no speak.

    No, we're not allowed to flame each other but I see no problems whatsoever pointing out the idiocy of a nameless individual posting to another forum. :p
     
  13. D4F Guest

    D4F

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    Planet Earth
    #13
    :D:D:D:D:D
     
  14. sir. mac thread starter macrumors regular

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    Nov 21, 2006
    #14
    Managed to o/c, but it caps at 500/800. This is stable, using ATI-tool in Bootcamp-Vista. Even though it´s a 8800M GTS it should be able to go higher. It probably needs some other drivers, or a way for Vista to recognize it as the m-GTS.

    Could somebody try with the drivers from LaptopVideo2go and see if it is possible to get a higher setting with ATI-tool?

    Edit:

    Heres the specs for the 8800m GTS:
    GeForce 8800M GTS
    Stream Processors 64
    Core Clock (MHz) 500
    Shader Clock (MHz) 1250
    Memory Clock (MHz) 800
    Maximum Memory 512MB
    Memory Interface 256-bit

    It should be possible to o/c quite a bit from the 500/800 I got.
     
  15. Kittychan macrumors regular

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    Feb 13, 2008
    Location:
    Wellington, New Zealand
    #15
    The apple guy told me that iMac 8800GS is actually 8800GF. so what da heck is 8800GF?????
     
  16. QCassidy352 macrumors G3

    QCassidy352

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    Mar 20, 2003
    Location:
    Bay Area
    #16
    it's an 8800M GTS and at regular clock... read the thread.
     

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