I have a new Lenovo 50-45 that was operating extremely slow. I closed a few apps that were eating resources and polished up what I could but no improvement. So, I installed more Ram. The guy at Best Buy told me that all RAM sticks were virtually the same. He sold me a PNY 4gb DDR3. The computer froze. The stick that was in it said it was a Samsung Product. Did he sell me the wrong stick?