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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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CPU Upgrade from i5 3.4 GHz to i9-9900k?

Hello Guys.

I need some help, I bought 27” iMac 2017. Which has Intel 3.4 GHz i5.

But my question is, is it possible to upgrade to i9-9900k or i7-9700k?

I would like to know if I can and I don’t want to damage my system.

I appreciate your comments, thanks.

Answered! View the answer I have this problem too

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Simple Answer not possible!

The i9 CPU’s use a different socket (high heat) and the systems EFI (BIOS) doesn’t offer the needed firmware support.

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Could you tell me which CPU could be work for that iMac? Thank you for your answer.

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The top CPU in this series is the 4.2 GHz i7-7700K

iMac "Core i7" 4.2 27-Inch (5K, Mid-2017)

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i7 7700k and i9 9900k share the same LGA 1151 socket. Probably it wouldn't work due to EFI restrictions or something.

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If you are in the SF Bay Area and have the CPU, I can rebuild the firmware. This is not rocket science. Man made machines should have ways to make them work. Never say no without giving a try.

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lopezclever will be eternally grateful.
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