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Model A1225 / Early 2009 / 2.66, 2.93, or 3.06 GHz Core 2 Duo processor

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Upgrade the GT120m GPU to 5750m from 27" iMac

I currently have a 2.93 Ghz C2D early 2009 iMac with a GT120m GPU. Recently it has stopped working as well and is due for an upgrade/replacement. I know that the GT130m and 4850m will work with no problems, but would the 5750 from the 27" iMac also work. They both use the same MXM 3.0 Type B socket and the 5750 (which is actually a 5850m) has a lower TDP than the 4850. This would mean that I should have no problems physically installing the card, and it wouldn't overheat the computer. Software wise would this setup work? The GPU is indeed an Apple version and has appropriate drivers.

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Not sure if it would actually work. I’m in your same situation except mine works for a bit, then freezes up. I tried using a Radeon HD 4670 from a 2010 iMac, and my iMac didn’t show an image. Then again, I didn't let it boot all the way to see if it would actually show something. (Didn’t have enough time to properly test.) I need to get another GPU on my hands and see if the Mac will recognize it once in the fully booted stage. I also want to try and see if I can run it without the GPU and just use the integrated 9400M for the time being. That would get me along until I can get a Radeon HD 4870 to install.

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Harry sera éternellement reconnaissant.
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