|Some memory are not compatible with each other. There are a number of specs that need to be the came in order to be able to run together, not just the speed of the memory which you do not even mention. There is the Voltage and the timings that you need to pay attention to. If you put in one stick and then go to Crucial.com and run their test, it will show you what memory you can purchase that will run with what you have.|
You have to be a little bit crazy to keep you from going insane.