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I'm curious what those would be in the modern era?

The "non-PC" x86 chips I can think of:

80186/188 - Sort of predates the IBM hegemony, can be hammered into shape by adding replacements for onboard peripherals 80376 - a failed long-gone experiment 386CX/EX - not entirely sure how incompatible they are Xeon Phi/Larrabee/Knight's Corner designs -- not really SoCs so much as special purpose acceleratirs.

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The PS4 (and probably PS5 as well) use x86 chips but are not PC-compatible.

I think the Moorefield and Merrifield SOC platforms are not PC compatible?

Also these: https://en.wikipedia.org/wiki/Intel_Quark

They are basically a 486 pipeline with some Pentium instructions.

Unfortunately it seems Intel didn't realise that x86 without the PC legacy is worth little, so their attempts at non-PC x86 have mostly failed. On the other hand, "PC-on-a-chip" SoCs like https://en.wikipedia.org/wiki/Vortex86 have enjoyed more popularity.

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