What computer hardware is this running on? What sort of "server farm" does a modern submarine have? Do they need to be super hardened operation in a vehicle t

What computer hardware is this running on? What sort of "server farm" does a modern submarine have? Do they need to be super hardened operation in a vehicle that may be called to launch its missiles in a high radiation zone? In a worst-case scenario the sub my surface in the middle of or end of a nuclear war. They probably want to ensure that the missiles get underway even in such extreme conditions