Can you go 5 miles over the speed limit in California?

Can you please clarify for me, is it legal to exceed the speed limit by 5 miles per hour while driving in California? I understand that speed limits are in place for safety reasons, but I'm curious if there's any flexibility or allowance for a slight increase in speed without facing consequences. Is there a specific law or regulation that governs this matter, and what are the potential penalties for exceeding the speed limit, even by a small margin?