PowerShell might not make sense if you'll only ever need to worry about one instance. If it's just peak usage you want then PerfMon is a good choice. With a few clicks you can setup a PerfMon Log with the CPU counters you want and end up with a delimited log file you can analyze. You can then pull that log into Excel and show it as a chart. If you use the DMV method you have to implement all the polling, collecting and scheduling stuff yourself.