this post was submitted on 09 Oct 2023
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TPM isn't even really the big blocker for most of the CPUs that were excluded -- many have TPM 2.0 functionality. The bigger culprit wrt compatibility is a virtualization security feature called MBEC (AMD has another name) If your CPU doesn't have MBEC the functionality can be emulated in software but it comes at a potentially hefty performance hit.
IIRC Intel 7th Gen has this feature but it doesn't work properly on some/all chips so that's why the Intel cutoff was 8th Gen. AMD has this feature on Zen 2 and above (Ryzen 3000) but Windows 11 supports Zen+ (Ryzen 2000 & 1600AF) using the emulation although it is indeed a large performance hit. I would see ~15-20% fps increase on my 1600AF in games when disabling the virtualization security settings. Now that I've moved to a Ryzen 5600 the difference between on and off is negligible.