DESC: Is your notebook PC acting sluggish? The remedy is some extra memory, which will boost its performance and application speed while letting you easily run multiple programs at the same time. Install easily with the instructions tailored for your machine Rely on HP Pavilion and Compaq Presario memory upgrade kits, which have been qualified and tested in HP Pavilion and Compaq Presario notebook PCs Compatibility: all HP Pavilion ze4000, ze5000, zt3000, zd7000, zx5000, and zv5000 series, as well as Compaq Presario 900, 1500, 2800, 2100, 2500, X1000, and R3000 series notebook PCs