A license to upgrade my HP Pavilion G61 Unfortunately I had not noticed that my basic 4GB were broken down into two 2GB modules So I had to replace one of the strips of 2 by it and I am not come to 6GB instead of 8 I wanted. In addition we must replace the first bar below because otherwise in the 2nd slot it is not recognized. Unfortunately, the performance is not improved notoriously (many other parameters affect the performance) but it will allow me to keep the PC a little longer.