Do you have a source for this? That sounds incredibly implausible--analog tolerances are basically never tight enough that you'd rely on them for something like

Do you have a source for this? That sounds incredibly implausible--analog tolerances are basically never tight enough that you'd rely on them for something like the DC value of an RNG's output, over temperature, normal production spread, etc. Any hardware RNG at least goes through digital processing to remove that bias, and usually goes through a cryptographically strong PRNG. As an aside, hardware RNGs are one of the only places you can put an undetectable backdoor in a design, since they can't be verified (since they're deliberately non-deterministic). If you do hash(stuff) ^ HRNG, then the CPU can make the result whatever it wants. If you do hash(stuff ^ HRNG) then it can't.