If undervolting is the new overclocking, you'd have to wonder if that changes anything.
In the underclocked variant (cooled only by one 80mm fan pretty far from the CPU) I pretty quickly started to recognize the program crashes from the CPU overheating alone.
In both cases the reason is too much heat undissipated, but underclocking, in some extreme situations, exhibit the same "undef" behaviour as the overclocked systems.