> I’d bet money that the different ISAs are full x86 and a subset of x86 You don't even need to bet, it's in the article: "Both SKUs will feature one big ‘Sun

> I’d bet money that the different ISAs are full x86 and a subset of x86 You don't even need to bet, it's in the article: "Both SKUs will feature one big ‘Sunny Cove’ CPU core, along with four little ‘Tremont’ Atom CPU cores" It's a different uArch, but the same ISA. The extension support would be the only concern here, which is super minor.