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Core based Pentium/Celeron and some of the ULV CPUs have had AVX disabled since Ivy Bridge.

A little overstated to say that's half their SKUs, but I see your point.

There is even more nuanced though, because Intel runs avx instructions at a different clockspeed than the main chip. So certain SKUs have avx support but have differences that don't reflect the CPU clock difference.

There is even more nuance to this as AVX low level instruction support isn't going to be universal as different CPUs will support different instruction subsets of AVX-512 and Extended AVX https://en.wikipedia.org/wiki/AVX-512

There is also a mess in FMA support for both Intel and AMD cpus... https://en.wikipedia.org/wiki/FMA_instruction_set

This entire deal pretty much turned AVX into cancer outside of very specific circles, especially considering the wierd support for AVX and SSE in OpenCL.

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