Suppose a nanosatellite is made with several commericial grade SBC working together. And we design it so as to give output based on majority voting type of algorithm. I am aware of the SEU's and high energy particles which can destroy circuitry of non radiation hardened devices. I am interested in how much reliable will be such a design compared to a single flight grade board  ?

Suppose a nanosatellite is made with several commercial grade SBCs working together. And we design it so as to give output based on majority voting type of algorithm. I am aware of single event upsets and high energy particles which can destroy circuitry of non radiation hardened devices. How reliable would such a design be compared to a single flight grade board?