You can find the memory location in the service and maintenance guide for your laptop. Follow the link.
in the WLAN compartment
The purpose of a notebook memory finder is to help locate or recover system memory such as RAM memory to help speed up the performance of a notebook computer.
The battery time can vary from notebook to notebook. On average, a HP notebook battery can last anywhere from four to eight hours on a single battery charge.
Since the only difference in your detail - is the amount of memory (4GB against 2GB) - go for the 4GB machine. The extra memory will help Windows 7 run faster.
A Lenovo notebook can be compared to a Dell or Hp notebook by themselves having different features from each other. Some features may please customers, while some won't.
Cache is an on-board memory. So, it is located on your motherboard.
Mobile Desktop
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A person could purchase a HP Pavilion notebook directly from the official HP website. Other places one could buy are Best Buy, Amazon, Staples, and MicroCenter.