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  1. #1
    Question Problems with graphics card - Advice 2010 27inch iMac 5750 card
    Hi, new to the forum but thought I would try to get some advice.

    Problem - iMac boots and gets to desktop - but shortly after glitches with purple and green squares flashing over screen and freezes within a minute or 30.

    I have been using it in target display mode with a windows pc since the start of the year (when the freezes started) no problem as long as I get time to press command F2 to put it in target display mode.

    I haven't used it as a desktop for a fair while but I can launch a game (Bioshock 3 at start of year was the last) and it will run fine until I go back to desktop, mysterious.

    I have now bought a nice new 30 inch monitor to use with the pc and want to fix the iMac to use as basically a web browser/pdf viewer.

    Anyway I am pretty sure it is a failing video card after doing some research on the topic. The problem is my research only really turned up people wanting to upgrade video cards but I want the cheapest card that will work.

    So I am willing to spend say around $150 - I am also willing to take some risks around compatibility and have taken the screen out and been at the graphics card before when it first stopped working and don't have much to lose.

    So what is likely to work and what are the cheapest options.

    Been looking at different laptop cards that match those that apple used in models from 2009-2011, but don't want to take the plunge without some advice.

    Could I use this from ebay and I know this wasn't used in an iMac but I could perhaps use some kind of hackintosh kext.

    Any help would be awesome!

  2. #2
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    pigoo3's Avatar
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    Quote Originally Posted by brharrow View Post
    Anyway I am pretty sure it is a failing video card after doing some research on the topic. The problem is my research only really turned up people wanting to upgrade video cards but I want the cheapest card that will work.

    So I am willing to spend say around $150 - I am also willing to take some risks around compatibility and have taken the screen out and been at the graphics card before when it first stopped working and don't have much to lose.

    So what is likely to work and what are the cheapest options.

    Been looking at different laptop cards that match those that apple used in models from 2009-2011, but don't want to take the plunge without some advice.
    What you may not realize is…Apple iMac's are not like Windows desktop computers…where video cards can just be swapped in & out. On most iMac models…there is no "video card". The "video hardware" is soldered directly into the logic board (not swappable or changeable).

    There is the rare iMac model that does have a socketed "video card"…and if you've been inside your 27" iMac…and if it does have a socketed video card…then you may be in luck.

    If this is the case…then generally the replacement video cards are best sourced from the same iMac "family". Meaning the other models released at the same time (in this case 2010 iMac's).

    In your case…the Radeon 5750 is the best video card offered in 2010 27" iMacs. So you would primarily be looking for a replacement 5750.

    But…this all depends on if your iMac has a socketed video card. If not…then it needs a replacement logic board.

    - Nick

    p.s. FYI…we DO NOT discuss anything "hackintosh" related at Mac-Forums.
    - Too many "beachballs", read this: Beachballs
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  3. #3
    Sorry for breaking rules.

    The graphics card is a mxm socket with huge heatsink attached.

    Does the forum know if the card can be any mxm card like used in standard laptops that was used in imac series 11

    ie. one of 4850, 4670, 5670, 5750

    or even any mxm card that apple has used in other laptops or other products.

    Thanks for your response.

  4. #4
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    pigoo3's Avatar
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    Quote Originally Posted by brharrow View Post
    The graphics card is a mxm socket with huge heatsink attached.

    ie. one of 4850, 4670, 5670, 5750

    or even any mxm card that apple has used in other laptops or other products.
    Thanks for verifying that your 27" iMac has a socketed video card.

    To be very honest…replacing or swapping video cards in iMacs is not a common occurrence (in fact it is quite rare). So info on it is going to be very limited.

    What I will say is…for best success…using a video card from the same series iMac is probably the best bet (2010 27" iMac). Beyond this is going to be experimentation (unless you can do some internet searching to find info otherwise).

    The 2010 27" iMacs used the following video cards:

    - Radeon 5670
    - Radeon 5750

    So if it were me…these are one of the replacement video cards I would be looking for. And since your iMac has a 5750 (and the 5750 is the better card)…I would be looking for that one.

    - Nick

    p.s. If the 21.5" 2010 iMac's also have socketed video cards…I'm not sure if they will work in the 27" models (since the 27" models didn't ship with all of them). The 21.5" 2010 iMac's came with Radeon HD 4670 & Radeon HD 5670. I'm not 100% sure if the 5670 used in both of the 21.5" and 27" 2010 iMacs are the same shape.
    Last edited by pigoo3; 09-05-2014 at 11:45 AM. Reason: added p.s.
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  5. #5
    Thanks for responses.

    I am trawling ebay now looking for the cheapest viable option, lucky I'm a gamblin' man.

    Decision will be made soon!

  6. #6
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    pigoo3's Avatar
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    I just took a look. They certainly aren't cheap. The good thing with eBay is. If someone sells you something that doesn't work…and if the seller doesn't do the right thing…you can open a dispute to rectify things.

    If you decide to replace the video card…please post how things went. This sort of info is hard to come by…so it would be great to hear from you after it's done!

    Good luck,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  7. #7
    This I think is the one I will get

    Hey, it might work.

    It is ordered
    Last edited by brharrow; 09-05-2014 at 12:56 PM. Reason: Fixed Link added Ordered

  8. #8
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    pigoo3's Avatar
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    Your link isn't quite working right…but I figured it out.

    If that 6770 card works…that will be pretty amazing…and some useful knowledge. That card is from an HP laptop…so who know's if it will work in an iMac. It's MUCH less expensive that the 5750's I saw on eBay US.

    Good luck,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  9. #9
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    chscag's Avatar
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    I don't want to sound pessimistic but I too would be amazed if that card works in your iMac. For sure let us know how it all turns out.

  10. #10
    Good or bad I will let you know what happens.

    Based on what I have researched and think - I expect that it will not work during efi boot (black screen), but should work with the drivers already in the system once finder loads, like it does on a Mac Pro with generic video card. I may have modify a plist file or attempt to modify firmware on the card or something.

    As a last resort I will create a Windows install on another machine, and then swap in the hard drive to the iMac from experience I am certain I will get a windows desktop eventually. It does take the mac a bit of thinking before it will boot a straight Windows or Linux disk but I have done this on a similar era Macbook Pro and it does eventually.

    Anyway I can always try another card.

  11. #11
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    harryb2448's Avatar
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    Worry about that 'pulled from a HP laptop'. We are talking your iMac?
    Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  12. #12
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    pigoo3's Avatar
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    I agree...I will be surprised if the 6770 video card the OP is thinking of using works. But...the OP does sound like a pretty handy person from what they mentioned...so it wil be very interesting to see what happens!

    For what it's worth. The 6770 video card the OP is going to try costs about $45US. When I searched eBay for a genuine 27" 2010 iMac 5750 (with heatsink) video card...it was like $400-$500 bucks!

    If the OP gets this HP laptop 6770 card to work...and only costs $45US...that will be pretty amazing.

    For what it's worth #2. Apple did use a Radeon 6770m video card/video hardware in "Late 2011" 15" and 17" MacBook Pro's. And in some "Mid-2011" iMac's. But of course in the MacBook Pro application...this video hardware was soldered (not a socketed card)...like it is in the HP laptop,

    So who knows...maybe the OP has a shot at getting this to work.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  13. #13
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    harryb2448's Avatar
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    My iMac uses that very card Nick but says 'built in':-


    AMD Radeon HD 6770M:

    Chipset Model: AMD Radeon HD 6770M
    Type: GPU
    Bus: PCIe
    PCIe Lane Width: x16
    VRAM (Total): 512 MB
    Vendor: ATI (0x1002)
    Device ID: 0x6740
    Revision ID: 0x0000
    ROM Revision: 113-C0170C-181
    EFI Driver Version: 01.00.588
    Displays:
    iMac:
    Display Type: LCD
    Resolution: 1920 x 1080
    Pixel Depth: 32-Bit Color (ARGB8888)
    Main Display: Yes
    Mirror: Off
    Online: Yes
    Built-In: Yes
    Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  14. #14
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    chscag's Avatar
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    My 21.5 iMac (2011 model) used the same card. But take note the card used in our iMacs is the "mobile" version not the same as was pulled from the HP. I believe the mobile version operated with lower voltages and definitely uses different drivers.

  15. #15
    Problems with graphics card - Advice 2010 27inch iMac 5750 card
    pigoo3's Avatar
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    I hear you guys. That's why I mentioned to the OP that this would be a bit of an experiment if trying to use that 6770 card.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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