What type of computers are used (generally) in robotic ( i.e. space probes and rovers) vs human craft (such as the ISS, soyuz)?

Subquestion:
What kind of specs are important on computers to operate in space?

I ask because I was curious as to the differences between say the laptops that they sometimes use on the ISS and space probes and also what kind of electronics principles do and don't work (or just are and are not efficient) in space.