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The 21.5-inch iMac unofficially supports up to Intel Core i9 processors; surpasses the 24-inch iMac with an Apple M1 SoC - NotebookCheck.net News
iMac (Retina 5K, 27-inch, 2017) CPU and NVME SSD Upgrade Pitfalls and Tips | Page 5 | MacRumors Forums
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Amazon.com: Apple MNED2LL/A 27-inch iMac Retina 5K Display, 3.8GHz Intel Core i5 Quad Core, 8GB RAM, 2TB Fusion Drive, Silver (Renewed) : Electronics
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