1: Spectre is the general case, Meltdown is the Intel-only evil cousin. 2: Spectre applies to all modern processors with speculative execution, which includes

1: Spectre is the general case, Meltdown is the Intel-only evil cousin. 2: Spectre applies to all modern processors with speculative execution, which includes smartphone-class ARM processors. Raspberry Pi's and microprocessors ("toasters") are not affected. 3: There's some prior work - Spectre didn't fall from thin air - but using speculative execution as the basis of an exploit makes Spectre the first bugs in, I believe, a new class. (Meltdown, on the other hand, is just a silly mistake that shouldn't be repeated.)