Greetings! My moms friend owns a 2010 Unibody macbook that she just updated to Yosemite. Its extremely slow! Her husband wants her to buy a new one but i suggested giving it a 4gb Ram stick as looking at istats it only has 50mb Free Ram of wiggle room with it on idle. CPU usage is very low. So if i have it a 4gb DDr3 stick plus the 1gb thats already in there (it has 2gb 1gb stick times 2) giving it 5GB of ram would that give it the proper boost?