Um well presumably they have different numbers of pins.
On a more serious note go to click here enter your motherboard details and it will tell you what memory is OK for you. Their service is second to none.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?