While doing research on how to power all my sata drives, I came across lots of scary stories about molex->sata power adapters catching fire. This guy on youtube made an interesting video about what to avoid when selecting such an adapter...
https://www.youtube.com/watch?v=TataDaUNEFc&feature=youtu.be&t=117
*sadly enough, the same guy had one catch fire because he ignored his own advice...
https://www.youtube.com/watch?v=EYkof-csPfI
*and the cab