HP 4415s Memory Modules - Windows Vista and Windows 7 - Page 5

Adding or replacing memory modules The computer has one memory module compartment, which is located under the keyboard. The memory capacity of the computer can be upgraded by adding a memory module to the vacant expansion memory module slot or by upgrading the existing memory module in the primary memory module slot. Your computer may support either DDR2 memory or DDR3 memory. DDR2 and DDR3 memory modules are not interchangeable-all memory modules installed in the computer must be the same type. When upgrading memory capacity, verify that the upgrade modules are the same as those already installed in the computer. To prevent the use of incompatible components, the positioning notches are different on DDR2 (1) and DDR3 (2) memory modules as shown in the illustrations below. Be sure to check the location of the notch on new modules before opening the protective packaging. Open packages of memory modules cannot be returned. WARNING! To reduce the risk of electric shock and damage to the equipment, unplug the power cord and remove all batteries before installing a memory module. CAUTION: Electrostatic discharge (ESD) can damage electronic components. Before beginning any procedure, touch a grounded metal object to be sure that you are discharged of static electricity. 1