8GB KIT (2 x 4GB) for Dell Precision Notebook Series Mobile Workstation M2400 Mobile Workstation M4400 Mobile Workstation M6300. SO-DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
parts-quick 4GB Memory for Dell Precision M4400 Mobile Workstation DDR2 PC2-6400 800MHz Laptop SODIMM Compatible RAM at Amazon.com
CMS 8GB (2X4GB) DDR2 6400 800MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Dell® Precision Mobile Workstation M4400 - A41 - Walmart.com