Answer

"S/K" LED indicates the installing CPU is Skylake-X or Kaby lake-X, it lights red when installing Skylake-X CPU; lights white when installing Kaby lake-X CPU.

Reference

Models

  • X299 TOMAHAWK
  • X299 TOMAHAWK AC
  • X299 GAMING M7 ACK
  • X299 RAIDER
  • X299 SLI PLUS
  • X299 GAMING PRO CARBON AC
  • X299 TOMAHAWK ARCTIC
  • X299 GAMING PRO CARBON
  • X299 XPOWER GAMING AC