Your in luck your system has a removable graphics card! The original part in your system is an ATI Radeon HD 4670 with 256 MB of onboard RAM.
Here are the two parts that would work in your system:
* ATI Radeon HD 4670 with 256 MB - Apple P/N 661-5539
* ATI Radeon HD 5670 with 512 MB - Apple P/N 661-5546
Both are around $ 250 - 300 US
And here is the IFIXIT guide you'll need to follow: [guide|6272|iMac Intel 21.5" EMC 2389 GPU Card Replacement]. It's a bit of work so you may want to think this through if you can handle it.
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Lastly, Keep in mind MacOS Serra will be the last OS for this system.
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Lastly, Keep in mind MacOS Sierra will be the last OS for this system.
Your in luck your system has a removable graphics card! The original part in your system is an ATI Radeon HD 4670 with 256 MB of onboard RAM.
Here are the two parts that would work in your system:
* ATI Radeon HD 4670 with 256 MB - Apple P/N 661-5539
* ATI Radeon HD 5670 with 512 MB - Apple P/N 661-5546
Both are around $ 250 - 300 US
And here is the IFIXIT guide you'll need to follow: [guide|6272|iMac Intel 21.5" EMC 2389 GPU Card Replacement]. It's a bit of work so you may want to think this through if you can handle it.
Lastly, Keep in mind MacOS Serra will be the last OS for this system.