Intel’s Content Depot or the Wayback Machine (Internet Archive). The better source: Manualslib.com or Archive.org .
To get the right manual, look for a small white barcode label on the board. It will have a 6-digit number followed by a 3-digit number (e.g., AA D53350-205 Common boards that carry the "21 B6 E1 E2" mark include: (LGA 775, Core 2 Duo era) (LGA 775, Pentium 4 era) (LGA 1155, 2nd/3rd Gen Core i3/i5/i7) The Retro Web 📖 Common Manuals & Guides intel desktop board 21 b6 e1 e2 manual better
Do you have the from the board's barcode label so I can find the exact manual for you? Intel’s Content Depot or the Wayback Machine (Internet