Elpida 4gb (2 x 2GB) 1Rx8 PC3-12800S-11-10-B2 SDRAM | eBay
2GB 1Rx8 DDR3 SODIMM PC3-10600 1333MHz 204-Pin Non-ECC Unbuffered CL9 1.5V Laptop Memory Module EBJ20UF8BCS0-DJ-F Compatible Replacement Spare Part for Elpida Compatible and Other Systems at Amazon.com
HP 581097-001 - 4GB, 800MHz, 240-pin, PC3-8500, DDR3-1066 SDRAM Small Outline Dual In-Line Memory Module (SODIMM) Part 581097-001 641369-001