I have an i7 processor at home with an expensive graphic card for gaming. However for work we only need minimum processing power e.g. office apps. Is there a major difference in getting an i3 versus i5 processors for the office.
For the office, you won't see a difference between i3 and i5. Unless the "office" is an architect or the like - and therefore using relatively sophisticated graphics programs. But i3 is still very good, even for an "entry level" processor, and you won't see any any difference when using everyday applications.
Hi, i3 processors are generally much slower than i5 processers and coming from an i7 you will notice the difference.
However if you compare an i5 processor with that of an i7 one (if clean hard drives), there is not much of a difference, so it depends on how efficiently or quickly the people in your office will use the machines.