If you are unable to find the manual, most "D33D66" era boards share these common traits: Usually LGA 775 (for Intel Core 2 Duo/Quad). Most take DDR2 or early DDR3. Front Panel: MSI typically uses a standard JFP1 connector layout. MS-xxxx number so I can find the exact wiring diagram for you?
Finding the right documentation for a specific motherboard can be a headache, especially when dealing with older or proprietary components. The is a common identifier seen on older, robust systems, often associated with HP, Dell, or Acer workstations, such as the Acer IPSB-AG and certain Dell Precision workstations.
printed on the board (like a 6-digit number or a name like "Baker" or "Erica"), I can find the exact wiring diagram HP MOTHERBOARD E162264 Hp D33d66 With I5-6500 - eBay
Since "D33D66" applies to many different boards, use one of these methods to find the specific model needed for a manual: HP MOTHERBOARD E162264 Hp D33d66 With I5-6500 - eBay