Which I7 Cpu Suitable For Imac Retina 5K Late 2014 Imac Intel 27 Retina 5K Display

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Hi, I have i5 iMac Retina 5K Late 2014, I want to upgrade the CPU, but what is possible i7 CPU ? Can anyone tell me? cheers.

You are limited to what Apple used in your system series, so looking at EveryMac listing for your models listing: iMac15,1 We can see the 4.0 GHz Core i7 (I7-4790K) is the best CPU Apple offered.