All my fans are connected directly to my PSU. If they told you having a 3 pin fan plugged into a molex caused damage, then they don't know what they are talking about.
As others have said, that cable you have posted is a cable for the fan, it looks absolutely fine.
It seems that company are making up what they're telling you.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.