The marking "21 B6 E1 E2" (sometimes written as /21-B6-E1-E2 ) found on an Intel Desktop Board is a regulatory marking
If you are currently assembling a system with an Intel desktop board, most follow this standard assembly process provided by Intel Support : Intel® Desktop Board D845GERG2/D845GEBV2 Product Guide Intel Desktop Board 21 B6 E1 E2 Manual
To ensure optimal performance and reliability, follow these troubleshooting and maintenance tips: The marking "21 B6 E1 E2" (sometimes written
The Intel Desktop Board covered in this manual targets legacy value or business desktop systems. It supports (depending on specific chipset: 915G/945G/946GZ/GL). The codes “21 B6 E1 E2” often appear on PCB silkscreen or BIOS labels for factory identification. Intel Desktop Board D945GNT — Manual / Service