Good morning. I have an HP Pavilion dv6-6135dx Laptop with AMD Quad-Core A8-3500M 2.4GHz, 6GB DDR3, and running Windows 7 Home Premium 64-Bit. The serial number, if it helps, is: 5CP1273HJ5. I would like to upgrade to 16GB of RAM, but am confused about the CAS Latency. Will it only work with the currently installed CL 11, or will lower numbers work, too? And does anyone have suggestions where it can be purchased at the best (lowest) price? Thank you for your time and help with this.