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HP Laptop EliteBook Intel Core 2 Duo SL9400 (1.86GHz) 4GB Memory 250GB HDD Intel GMA 4500MHD 12.1" Windows XP Professional (available through downgrade rights from Genuine Windows 7 Professional) 2530 - Newegg.com
8GB KIT (2 x 4GB) for HP-Compaq EliteBook Series 2530p 2730p 6930p 8530p 8530w 8730w. SO-DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
2GB DDR2-800 (PC2-6400) RAM Memory Upgrade for the Compaq HP EliteBook 2530p (NJ885UC#ABA) at Amazon.com
Solved: Missing RAM slot in EliteBook 8540p - HP Support Community - 1800127
2GB [1x2GB] Memory RAM Upgrade for the Compaq HP EliteBook 8530p, 8530w, 8730w | eBay