: Most commonly LGA 1155 (supporting 2nd and 3rd Gen Intel Core processors) or LGA 1150 (supporting 4th Gen).
If you want, I can fetch the official spec sheet now and summarize exact details (memory max, exact SATA count, chipset model) — say "fetch spec sheet". intel desktop board 21 b6 e1 e2 specification link
The alphanumeric code (often found near marking E210882) is a regulatory or industry specification marking rather than a specific Intel motherboard model name. However, this marking is most commonly associated with boards featuring the LGA 1155 socket and 2nd Generation Intel Chipsets (like the H61 or Q67). General Specifications : Most commonly LGA 1155 (supporting 2nd and