It goes inside of the laptop. All computers (laptops, servers, workstations, etc.) have memory slots on the motherboard typically where the memory gets installed. Ex. - The black slots in this photo It's a beast to say the least, but unfortunately it wasn't mine...it was my bother-in-law's. He just gave me the memory that was in it as partial payment for working on it. He opted for dual 750GB HDDs when ordering it. If it were mine...SSD's all the way and it would easily score 7.9 or higher in Windows.