The memory slot diagnostic card for notebooks is BD, and the desktop memory slot diagnostic card is DD. Purchasing BD alone cannot be used because the code display is located on the DD diagnostic card. The memory slot diagnostic card is compatible with most motherboards that have memory slots. For computers with only onboard memory, meaning motherboards without memory slots, the V8 multifunction diagnostic card must be used. The memory slot diagnostic card offers strong compatibility. The DD diagnostic card works with desktop computers and all-in-one computers. The BD version is compatible with various brand computers, including standard notebooks, Alienware, and Apple MAC devices. Easy to use without needing to locate various diagnostic interfaces on the motherboard. For older notebooks using DDR3 memory slots, such as the Lenovo E450, the memory diagnostic card cannot be inserted in parallel and must be inserted into the motherboard memory slot at a 45-degree angle. Type: Computer diagnostic card Color: White + Green Material: PCB Package Contents: 2 x Memory slot diagnostic card 3 x Cable (Random color, specific color cannot be selected) Only the items listed above are included; other products are not included. Note: Lighting reflections and differences in display screens may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may have an error margin of +/- 1-3 cm.