iMac 2017 CPU upgrade

[startergo]

So this iMac has LGA1151 socket and what chipset? Does someone know? I know originally x299 chipset was only supporting i7-7000 series CPU's, but after a firmware update it can support i9-10900 series CPU's. What are the limitations of the iMac 2017 CPU chipset? As far as the thermal envelope is concerned i9-9900 is the same exact wattage as i5-7500.

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www.intel.com

I am aware that the memory modules are different, but is there a way to upgrade the ROM to support this CPU?

 

[Nguyen Duc Hieu]

So this iMac has LGA1151 socket and what chipset? Does someone know? I know originally x299 chipset was only supporting i7-7000 series CPU's, but after a firmware update it can support i9-10900 series CPU's. What are the limitations of the iMac 2017 CPU chipset? As far as the thermal envelope is concerned i9-9900 is the same exact wattage as i5-7500.

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www.intel.com

I am aware that the memory modules are different, but is there a way to upgrade the ROM to support this CPU?

Only Google knows.

iMac "Core i7" 4.2 27" (5K, Mid-2017) Specs (Retina 5K, Mid-2017, BTO/CTO, iMac18,3, A1419, 3070): EveryMac.com

Technical specifications for the iMac "Core i7" 4.2 27" (5K, Mid-2017). Dates sold, processor type, memory info, hard drive details, price and more.

everymac.com

You CAN NOT plug an LGA1200 socket CPU (gen10) to an LGA1151 sockets (gen7)

For LGA1151 v1 socket (gen7) to recognize LGA1151 v2 CPUs (gen 8 or 9), you need to modify the BIOS on the PC, but the success rate was low and limited to core i3 CPUs.

No one has ever success with an iMac in this matter.

 

[startergo]

No one has ever success with an iMac in this matter.

Lga1200 was only mentioned for reference of upgradeability. Is it only the ME region which has to be modified?

 

[Nguyen Duc Hieu]

Lga1200 was only mentioned for reference of upgradeability. Is it only the ME region which has to be modified?

If you insist on it, then good luck.
I haven't seen a successful story for this thing yet, even though I know some modded products (mainboard) of LGA 1151v1 successfully paired with an intel core i3-8100, their owner claimed that the modded BIOS can't be used for core i5-8400 or higher. And that was all the real story from the Windows PCs only.

 

[startergo]

I found this:

Intel Coffee Lake 8th Generation Desktop Processors Come With Pin Changes, More Ground and Electrical Pins Active Compared To Skylake and Kaby Lake Processors​

According to David, the reason we don't have Coffee Lake processors compatible with older series motherboards that feature the LGA 1151 socket is the change in pins. For instance, if the pin config changes on a processor, the sockets on the motherboard need to be configured as such. It's not a process that can be done via software as its more of a hardware level change.

Intel Coffee lake Uses Different Pin Configuration Than Kaby Lake and Skylake on the LGA 1151 Socket

Intel's Coffee Lake CPUs use a different pin configuration compared to Kaby Lake that details their exclusivity on the 300 series boards.

wccftech.com

9th and 8th Generation Intel® Core™ Desktop Processors use an LGA1151 socket. However, they require motherboards based on Intel® 300 Series Chipset. Some Intel® 300 Series Chipset based motherboards may need a BIOS update to support 9th Generation Intel® Core™ Desktop Processors. Please check with your motherboard manufacturer for details.

These processors aren't backward compatible with motherboards based on Intel® 200 Series Chipset and Intel® 100 Series Chipset.

Similarly, 7th Generation Intel® Core™ Processors and 6th Generation Intel® Core™ Processors aren't compatible with the Intel® 300 Series Chipset motherboards.

The Desktop Intel® Core™ processors 6th and 7th Generation support both DDR3 and DDR4 memory. The Desktop 9th and 8th Generation Intel® Core™ processors supports only DDR4 memory.

Compatibility of Desktop 9th and 8th Generation Intel® Core™...

Information about socket and chipset compatibility of desktop 9th and 8th Generation Intel® Core™ Processors.

www.intel.com