Intel Desktop Board 21 B6 E1 E2 Manual

The identifier "21 B6 E1 E2" (often preceded by /21) is a regulatory marking found on several vintage Intel motherboards, most commonly associated with the LGA 1155 socket generation

You can search for your specific model on the Intel Product Specification (ARK) Database. While specifications are listed there, direct manual downloads may no longer be hosted. 2. Third-Party Manual Archives Intel Desktop Board 21 B6 E1 E2 Manual

• Use only non-ECC, unbuffered DIMMs.
• Populate in order: DIMM 0 (blue slot) first, then DIMM 1 (black).
• Maximum supported: 4GB total (DDR2) or 8GB total (DDR3 G41 variant).
• Warning: Do not mix 1.8V DDR2 with 1.5V DDR3. Physically different notches, but some cheap boards forced it – this burns the memory controller.

Safety Precautions

Official Archive (Internet Archive)

• Search: "Intel DG31PR Product Guide PDF"
• Direct filename often: DG31PR_TechProdSpec.pdf