Hello. I built my PC about a year ago, and it currently has one 8 gb ram stick in it right now. Today I was taking apart this old windows vista computer that I no longer need and I found two sticks of 2 gb ram in it. I've been wanting to increase the ram in my pc for a while now. My question is, is it okay to add these two 2 gb sticks? Or should I just buy another 8 gb stick?