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Modelo A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 o 3.8 GHz Core i5 o 4.2 GHz Core i7 Kaby Lake Procesador (ID iMac18.3) / Retina 5K. Consulta las guías anteriores de iMac Intel 27 "Retina 5K Display (finales de 2014 y 2015) ya que el sistema es muy similar.

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What parts do the 2019 iMac support?

I would like to get a new 2019 iMac, but I don’t want to pay outrageous Apple prices, so I am looking into upgrading my current system.

There is an issue though, there is little to no information surrounding upgrading the CPU and drives in these systems.

I have no idea if this new model needs a thermal sensor like the older models, or if upgrading the base i5 8500 to a 9900K is even possible. Or, maybe only the versions with the 9600KF would be upgradable to the 9900K because the 8th and 9th Gen motherboards are different.

iFixit has not done a teardown yet, so I’m not sure. Does anyone have any experience with this?

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First upgrading your current system’s (2015/17) CPU to a newer version is not likely. Apple uses different EFI (BIOS) firmware per each series. So it won’t accept newer CPU’s.

You can upgrade within the series as Apple makes one version of the firmware for the given series. So within the new 2019 models iMac19,1 and likewise within the 2017 systems iMac18,3 and for 2015 systems iMac17,1

Even still I would be careful here as unlike the older systems the upper end CPU’s in this series are pushing the limits of the systems power & cooling. As we don’t know if Apple has a more beefy power supply and cooling setup for these high end models it would be risky upgrading it until we know.

Moving onto drives

Take the time to review this great guide The Ultimate Guide to Apple’s Proprietary SSDs which will give you all there is on the custom blade SSD’s. As far as I know the NVMe/PCIe 3.0 x4 blade drive used in the 2017 models is still used.

As far as the HDD’s Apple has modified its SMC firmware so now SMART is accessed from the drive. When it’s installed from the 2013 models and so far to the 2017 models. But as it’s so new a system we just don’t know what Apple has done in this series.

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Thanks for the really in depth answer! There is one more thing I am confused about though. You mentioned that there is one EFI for every iteration (in my case, iMac 19,1. But, it looks like Apple put TWO different generations of processor into one series. 8th gen (i5 8500 and 8600) AND 9th gen (9600KF and 9900KF). If they both have the same mobo and EFI, it would be like Z390 which can accept 8th and 9th gen CPUs. Or the same mobos have different EFIs which individually support the different generations. I really am not sure.

Also what is SMART? Is that the infamous temp sensor that we had to buy separately so the fans woulde’t spin at 100% all the time.

And information would be appreciated.

- de

Yes the 9600 & 9900 run hotter and may have different power supplies and cooling designs. It’s possible the firmware is different too we just don’t know.

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I tried a i5-8500 upgrade to i9-9900k in an iMac 27 2019, but at first sight it doesn’t seem to work. The iMac simply won’t turn on. USB devices power on, but the screen stays blank.

internals look very similar to the 2017 model.

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Dario, any luck getting it to start? The retention mechanism for these iMacs can be finicky. You have to be really careful how you’ve situated them, and have the correct amount of pressure. Many people accidentally bend pins not being aware of it.

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Ethan estará eternamente agradecido.
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