hdd voltage

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Hello,

My computer get starts to reboot all the time I do a higher hdd use (like: fsck, copying more GB of data). I was sure that my power supply its not enough so I changed it (300W->450W), now it does the same. I'm looking for a tool to measure the exactly power consumiton (voltage and amper) of my hdd, cpu and ram on FreeBSD. 
Do you have any idea?

Thank you!
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