1GB DDR2-533 (PC2-4200) Memory RAM Upgrade for the Compaq Presario SR Series Systems SR1522X, SR2020NX, SR2023NX, SR2050NX, SR2150NX, SR2163WM, SR2168HM, SR2170NX, SR2180NX, SR5010NX, SR5030NX LOW POWER CONSUMPTION LIFETIME WARRANTY FREE SHIPPING