Read the article guys. PRD doesn't mean anything in other than a 100% CPU load situation. Don't even look at it unless you go full CPU load.
On mine when idle or medium/low load it can be from 0% to ~600%. But its irrelevant.
Also, latest(s) HWiNFO version(s) support a tooltip option for every sensor in sensors window. You can enable it from sensor windows settings and learn the basics of them(sensors).