8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for the Dell Studio 1558 (Genuine A-Tech Brand) 8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for the Dell Studio 1558 100% Genuine A-Tech Brand Memory 4GB DDR3-1333 PC3-10600 Non-ECC Unbuffered 204 Pin 1.5V CL=9 Memory Limited Lifetime Warranty High Quality Ram specifically designed for the Dell Studio 1558