Hi, So I my Macbook Pro is indeed 13 inch late 2011. On Apples specs page it says this computer has a base memory of 4 GB and a maximum memory of 8 GB. It also says I have two memory slots.

With these specs in mind, I am looking to purchase RAM to max it out at 8 GB. Do these specs mean I already have a 4 GB RAM drive in one of the two slots? If so should I only buy one 4 GB Ram and leave my old one in? Or would it be better to buy 2, 4 GB chips and take the older RAM chip out? Does that old RAM chip get fried? I'm trying to decide whether or not to purchase 1 or 2 (4 GB) RAM chips.

Thanks to whoever answers this!

-Milo