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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Apple iMac 27-Inch "Core i5" 3.4 (5K, Mid-2017) GPU Upgrade

Is the Intel Core i7-7700K Desktop Processor 4 Cores up to 4.5 GHz Unlocked LGA 1151 the highest performing CPU for this yeas iMac? If not, what is the best performer? Thanks.

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You are limited to what offered for your series. Getting an unlocked chip won’t help you as you can’t alter the systems clock timings.

Remember this is not a hobbyist system to mod! This is a a best balance for someone that wants good performance and style with the least amount of dickering about.

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First, thank you for your response. So, changing the CPU from an i5 to an i7 will not produce additional performance because on the clock speed limitations of the motherboard?

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@lightfinder - That’s not what I said, here are your options from EveryMac lookup: iMac18,3 the CPU’s listed will work across anyone of these. The premise you inferred was over clocking which you can’t do in an iMac.

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Thank you for the feedback.

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Your first upgrade should be to replace the standard hard drive with an SSD, this may give you all the speed increase you are looking for, here's how:

iMac 27" 2017 Hard Drive Replacement

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