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You could go with AMD which is seemingly immune to Meltdown, but apparently someone already found a security flaw with their PSP (aka their own Intel ME).

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If you need security and it doesn't need to be fast, use a raspberry pi.

No ME, no PSP, no meltdown, and no spectre.

The firmware driving the VC4 on an RPi is non-free and closed, and the VC4 runs with greater privilege than the ARM core, with access to all the RAM. This firmware may not have security bugs like the ME and the PSP have had, and it may not contain a backdoor that we know of, but technically there's nothing stopping it from having one without anyone in the public knowing it.

Still, no Meltdown and no Spectre on any RPi

I've seen rumors that new bios/uefi versions have a toggle to disable PSP.

So AMD looks like a fair choice if this is true.

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