For example, as shown in the figure is the number 4,194,304, then put 4194304 / 1024 / 1024, 4194304 / 1024 / 1024 = 4. It means the computer can support up to 4GB memory. If you are unsure whether this RAM is compatible with your computer, please download a program from the website to check your computer and confirm your CPU specifications. If your computer's specifications do not match our RAM information, do not purchase this item as it may not work properly with your system. Caution: The information shown in our images is based on a test computer and is for reference only. For more details about your system, refer to the "CPU," "SPD," and "Memory" sections. Sequence: PC2 6400 = DDR2 800MHz 6 Size: 13.3 x 3 cm Color: green Material: PCB Backed by superior design and rigorous testing, this product is engineered for long life and continuing value Capacity: 2GB Pins: 240-Pin Voltage: 1.8V Form Factor: DIMM Buffering/ECC: Non-ECC, unbuffered Compatible with most major desktops with Intel and AMD CPUs Ideal choice for Intel/AMD CPU motherboards How to check the maximum memory capacity supported by your computer: 1. Press the Windows key and R key to open the Run dialog 2. Type "wmic memphysical get maxcapacity" and press Enter 3. The result will display the maximum capacity in KB Memory RAM Pin Count Reference: DDR for Desktop: 184 pins DDR for Laptop: 200 pins DDR2 for Desktop: 240 pins DDR2 for Laptop: 200 pins DDR3 for Desktop: 240 pins DDR3 for Laptop: 204 pins Package Contents: 4 x Memory RAM Note: Only the items listed are included. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.