I am doing work in Adobe premiere pro and after effects, I upgraded the ram to 32 GB but with this processor it is still too slow.
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Sadly the CPU chip is soldered on your logic board in this series 21.5” iMac Core i5" 2.3 (Mid-2017)
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Is it possible to replace the logic board?
While you physically could, what would you put in, this system was a single model in the iMac18,1 Series this is the last plain Retina model as such you would need to also replace the display as the next generation is using a 4K display iMac19,2
Frankly, the costs of this would make it much more expensive than just finding a used system ands selling yours to recoup some of the costs.
The processor is soldered to the board so you cannot upgrade the processor. You will need equipment to do that, but it’s impossible
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Even if you had the equipment like dan says, You would need to replace the display too
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