8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Dell Studio 1558 (Genuine A-Tech Brand) at Amazon.com
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Dell Studio 1555 RAM Replacement - iFixit Repair Guide
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8GB (4GBx2) Team High Performance Memory RAM Upgrade for Dell Studio 1555 (DDR2) Model Laptop. The Memory Kit Comes with Life Time Warranty. at Amazon.com
CMS 8GB (2X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Dell® Dell® Studio 15 (1555) Notebook Ddr2 - A41 at Amazon.com
Dell Studio 1555 RAM Replacement - iFixit Repair Guide