I basically only find this online:

But it seems quite incomplete (i.e. where's Intel Core)?

Is there a list of processors that support SSE2? Or how much its used/supported right now?

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1 Answer

The answer is literally the first 3 sentences at the point you linked in the Wikipedia article:

SSE2 is an extension of the IA-32 architecture, based on the x86 instruction set. Therefore, only x86 processors can include SSE2. The AMD64 architecture supports the IA-32 as a compatibility mode and includes the SSE2 in its specification

This means virtually every modern Intel and AMD CPU supports SSE2.