Summary: Put this in a Gateway laptop from another vendor, and it worked just fine. No compatability issues. Just make sure you have matched speed with whatever you have and all will be recognized, otherwise it will go to the slowest speed of the 2. Other than that, had no issues.
Summary: easy to install, extra memory doesn't really make your computer faster, but it helps with multi-tasking. Chrome uses A LOT of memory, and my laptop used to freeze when I have too many tabs open, but the extra 4GB solved the problem. I'm happy.
Summary: Partly because of my own reservations concerning selection. I had 2 RAM slots <PC Laptop> w/a max of 8Gb. So it made it Crucial to replace the 2Gb...with a perfect upgrade. Crucial's site has a very good RAM analysis tool. Of course Amazon came in first with a price, and then add the selection, and efficient packing and shipping, and you get a man giggling at the new performance enhancement!!!! Thanks.