hi i have a samsung np355v5c laptop with 6 gb ram and a 500gb hard drive, ive looked into buying ram but its very expensive by itself so i was thinking about buying faulty (screens not 100% faulty) laptops and taking the ram from them to upgrade, same with the hard drive as id like 1tb at least. the problem is i dont know if any other samsung series 3 models would be compatible. i know the batteries are and the chargers but thats as far as my knowledge goes.