I don't know if it's still the case, but in terms of RAS, the Z/Series CPUs from ~2004 had duplicated/compared instruction-fetch/decode and execution units. ht

I don't know if it's still the case, but in terms of RAS, the Z/Series CPUs from ~2004 had duplicated/compared instruction-fetch/decode and execution units. https://pages.cs.wisc.edu/~remzi/Classes/838/Fall2001/Papers/tale-of-two.pdf https://pages.cs.wisc.edu/~remzi/Classes/838/Fall2001/Papers...