CPU usage is just a term which basically means how much the processor is being used. The graph will usually have a number of different lines on it
depending on the amount of cores the processor has which shows the usage in percentage per core, the more cores, the faster it can process commands.
CPU refers to your processor. The CPU usage graph usually determines how much your computer is processing. If you're having speed issues with your PC
and you see that the CPU graph is all the way up near peaking levels then you have too many things running or you have to upgrade your CPU. I think
some graphs even determine your CPU temperature, usually good for people who overclock their systems and need to keep an eye on their CPU. Most people
don't have any use for the graph.
CPU usage is just that. How much the CPU is being used. Put differently, a CPU has a certain capacity, a bit like an engine. It has a certain amount
of power and can execute a certain number of instructions per second. When CPU usage is at 100%, then the PC will appear to be sluggish and
unresponsive (worst case scenario).
Take video processing as an example, a fairly CPU intensive task due to all the calculations needed. CPU X can process 1 hour of video per hour. CPU Y
(being a newer and faster model) can process 1 hour of video in 45 minutes.
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