Hello jyaron,
For the CPU type you mentioned, you can expect CPU usage between 5-20% depending on which type of operation you are performing. The real-time spectrum analysis mode is going to have the highest CPU usage, followed by zero-span and modulation analysis operations, followed by standard spectrum analysis. For standard spectrum analysis we have an option to introduce a delay between screen updates which slows down the update rate and lowers CPU usage.
Regards,
A.J.