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AMD and ARM also has vulnerabilities similar to Spectre and Meltdown. For example http://fortune.com/2018/01/11/amd-chips-vulnerable-to-both-v... switching to AMD or ARM won't save you.

Many CPUs are vulnerable to Spectre, but Meltdown is much more severe and far easier to exploit. Meltdown is fairly specific to Intel.

AMD is vulnerable to Spectre, but nothing like Meltdown.