Physically inspect the motherboard for a small white barcode label. Intel boards are primarily identified by an AA number (Altered Assembly), which looks like E21088-xxx or similar.
Instead, "D33025" is a regulatory code or industry marking often found printed on various legacy Intel desktop boards. Because this marking appears on multiple different boards, a single manual for "D33025" does not exist. To find the correct manual, you must first identify your motherboard's true model name. Intel D33025 Motherboard Manual
Intel® Desktop Board DG35EC Technical Product Specification Physically inspect the motherboard for a small white
Open the Command Prompt and type: wmic baseboard get product,Manufacturer This will return the exact model name of your board. Because this marking appears on multiple different boards,
Press the Windows Key + R , type msinfo32 , and hit Enter. Look for BaseBoard Manufacturer and BaseBoard Product .