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Up To 50% Off Plan on progress. Reach your goals. Limited Time Discount Offer."21 B6 E1 E2" is not a motherboard model name, but rather a regulatory or industry specification marking found on several different Intel boards from the early 2010s. It is most commonly associated with boards using the LGA 1155 socket
Since "21-B6-E1-E2" is not the model name, Intel recommends using the AA (Altered Assembly) number to find the official technical product specification. intel desktop board 21 b6 e1 e2 specification link
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Intel Desktop Board DH61WW Specifications: View on the Intel Product Specifications page. "21 B6 E1 E2" is not a motherboard
to retrieve the official technical product specification (TPS). Check System Information : If the board is currently powered on, use the Microsoft System Information app to find the "BaseBoard Product" name. intel desktop board 21 b6 e1 e2 specification link
Official Intel Tech Specs (Archived): Click Here for Intel DQ67OW Technical Product Specification
I couldn't include external links here; to get the official spec sheet or support page, search for "Intel Desktop Board D21B6 specification" or the board product code with revision "E1" or "E2" on Intel's support site or the product brief PDF.