The demise of Cisco and Sun are cautionary tales. Nvidia's Huang is worried history could repeat itself.

• Jensen Huang isn't sitting comfortably atop the world's most valuable company.
• He doesn't want Nvidia to meet the same fate as Cisco or Sun, The Information reports.
• The two other companies were on top in the 90s, but collapsed when the dot-com bubble burst.

For Jensen Huang, unparalleled success has reportedly come with a healthy helping of anxiety.