Plenty of non-x86 got hit by those bugs. ARM got both. PowerPC was hit as well. Meltdown: Intel x86, IBM POWER, ARM Cortex-A75 Spectre: Intel x86, AMD x86, AR

Plenty of non-x86 got hit by those bugs. ARM got both. PowerPC was hit as well. Meltdown: Intel x86, IBM POWER, ARM Cortex-A75 Spectre: Intel x86, AMD x86, ARM (Cortex-R7, Cortex-R8, Cortex-A8, Cortex-A9, Cortex-A15, Cortex-A17, Cortex-A57, Cortex-A72, Cortex-A73, various Apple-designed cores) and some IBM hardware. Lots of devices are shared, thanks to things like javascript.